{"product_id":"fs-curtis-es50-bare-pump-5-7-5-hp","title":"FS-Curtis ES50 Bare Pump | 5-7.5 HP Single-Stage Cast Iron Air Compressor Pump | Part # FES50B","description":"\u003ch1 data-section-id=\"1e5giwh\" data-start=\"0\" data-end=\"96\" class=\"PDq2pG_selectionAnchorContainer\"\u003eFS-Curtis ES50 Bare Pump | 5-7.5 HP Single-Stage Cast Iron Air Compressor Pump | Part # FES50B\u003cspan aria-hidden=\"true\" class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\n\u003c\/h1\u003e\n\u003ch2 data-section-id=\"sjbid6\" data-start=\"98\" data-end=\"126\"\u003eShort Product Description\u003c\/h2\u003e\n\u003cp data-start=\"128\" data-end=\"490\"\u003eThe \u003cstrong data-start=\"132\" data-end=\"175\"\u003eFS-Curtis ES50 Bare Pump (Part #FES50B)\u003c\/strong\u003e is a premium industrial-duty single-stage reciprocating air compressor pump engineered for \u003cstrong data-start=\"267\" data-end=\"290\"\u003e5 to 7.5 horsepower\u003c\/strong\u003e compressor systems. Constructed from heavy-duty cast iron and designed to operate between \u003cstrong data-start=\"381\" data-end=\"402\"\u003e500 and 1,000 RPM\u003c\/strong\u003e, the ES50 delivers reliable compressed air while minimizing wear for long service life.\u003c\/p\u003e\n\u003cp data-start=\"492\" data-end=\"892\"\u003eWhether you're replacing a failed compressor pump or building a custom air compressor package, the ES50 offers the durability, efficiency, and proven reliability expected from FS-Curtis. Its slow-speed design, generous lubrication capacity, and robust construction make it an excellent choice for commercial garages, manufacturing facilities, woodworking shops, and industrial maintenance operations.\u003c\/p\u003e\n\u003chr data-start=\"894\" data-end=\"897\"\u003e\n\u003ch1 data-section-id=\"696igo\" data-start=\"899\" data-end=\"925\"\u003eFull Product Description\u003c\/h1\u003e\n\u003cp data-start=\"927\" data-end=\"1215\"\u003eThe \u003cstrong data-start=\"931\" data-end=\"959\"\u003eFS-Curtis ES50 Bare Pump\u003c\/strong\u003e is built for professionals who need dependable compressed air every day. Designed for compressors in the \u003cstrong data-start=\"1065\" data-end=\"1086\"\u003e5 to 7.5 HP range\u003c\/strong\u003e, this heavy-duty cast iron pump combines rugged construction with low operating speeds to maximize reliability and service life.\u003c\/p\u003e\n\u003cp data-start=\"1217\" data-end=\"1631\"\u003eUnlike lightweight aluminum pumps commonly found on consumer-grade compressors, the ES50 features an industrial cast iron design that dissipates heat efficiently while resisting wear under continuous operation. Operating between \u003cstrong data-start=\"1446\" data-end=\"1467\"\u003e500 and 1,000 RPM\u003c\/strong\u003e, the pump experiences less internal stress than high-speed alternatives, resulting in quieter operation, lower operating temperatures, and extended component life.\u003c\/p\u003e\n\u003cp data-start=\"1633\" data-end=\"1960\"\u003eThe ES50 is ideal for replacing worn pumps on existing compressor packages or for OEMs and fabricators building custom compressed air systems. With its \u003cstrong data-start=\"1785\" data-end=\"1814\"\u003e2A flywheel configuration\u003c\/strong\u003e, \u003cstrong data-start=\"1816\" data-end=\"1850\"\u003e3\/4\" BSPP discharge connection\u003c\/strong\u003e, and \u003cstrong data-start=\"1856\" data-end=\"1882\"\u003e1.5-quart oil capacity\u003c\/strong\u003e, installation is straightforward for many commercial compressor applications.\u003c\/p\u003e\n\u003cp data-start=\"1962\" data-end=\"2192\"\u003eFor decades, FS-Curtis has built compressors trusted by industrial professionals throughout North America. The ES50 continues that tradition by delivering dependable compressed air production with minimal maintenance requirements.\u003c\/p\u003e\n\u003chr data-start=\"2194\" data-end=\"2197\"\u003e\n\u003ch1 data-section-id=\"u0ybrq\" data-start=\"2199\" data-end=\"2213\"\u003eKey Features\u003c\/h1\u003e\n\u003cul data-start=\"2215\" data-end=\"2695\"\u003e\n\u003cli data-section-id=\"ywh2dt\" data-start=\"2215\" data-end=\"2259\"\u003eGenuine FS-Curtis OEM bare compressor pump\u003c\/li\u003e\n\u003cli data-section-id=\"1h5c9uf\" data-start=\"2260\" data-end=\"2309\"\u003eDesigned for \u003cstrong data-start=\"2275\" data-end=\"2290\"\u003e5 to 7.5 HP\u003c\/strong\u003e compressor systems\u003c\/li\u003e\n\u003cli data-section-id=\"1mmsb88\" data-start=\"2310\" data-end=\"2345\"\u003eHeavy-duty cast iron construction\u003c\/li\u003e\n\u003cli data-section-id=\"1a9ngw8\" data-start=\"2346\" data-end=\"2392\"\u003eIndustrial single-stage reciprocating design\u003c\/li\u003e\n\u003cli data-section-id=\"nwo2rq\" data-start=\"2393\" data-end=\"2436\"\u003eSlow operating speed of \u003cstrong data-start=\"2419\" data-end=\"2436\"\u003e500-1,000 RPM\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"17nvgrq\" data-start=\"2437\" data-end=\"2466\"\u003eSplash-lubricated crankcase\u003c\/li\u003e\n\u003cli data-section-id=\"12dsejv\" data-start=\"2467\" data-end=\"2498\"\u003e\u003cstrong data-start=\"2469\" data-end=\"2498\"\u003e2A flywheel configuration\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli data-section-id=\"1pik0ld\" data-start=\"2499\" data-end=\"2535\"\u003e\n\u003cstrong data-start=\"2501\" data-end=\"2514\"\u003e3\/4\" BSPP\u003c\/strong\u003e discharge connection\u003c\/li\u003e\n\u003cli data-section-id=\"lc9aq\" data-start=\"2536\" data-end=\"2564\"\u003e\n\u003cstrong data-start=\"2538\" data-end=\"2551\"\u003e1.5-quart\u003c\/strong\u003e oil capacity\u003c\/li\u003e\n\u003cli data-section-id=\"1escp3j\" data-start=\"2565\" data-end=\"2625\"\u003eExcellent replacement for worn or damaged compressor pumps\u003c\/li\u003e\n\u003cli data-section-id=\"b9dt00\" data-start=\"2626\" data-end=\"2695\"\u003eDesigned for long service life in demanding industrial environments\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2697\" data-end=\"2700\"\u003e\n\u003ch1 data-section-id=\"b8y6te\" data-start=\"2702\" data-end=\"2712\"\u003eBenefits\u003c\/h1\u003e\n\u003cul data-start=\"2714\" data-end=\"3178\"\u003e\n\u003cli data-section-id=\"17z4zcz\" data-start=\"2714\" data-end=\"2763\"\u003eLonger pump life thanks to slow-speed operation\u003c\/li\u003e\n\u003cli data-section-id=\"1gkh3l1\" data-start=\"2764\" data-end=\"2829\"\u003eHeavy cast iron construction withstands years of industrial use\u003c\/li\u003e\n\u003cli data-section-id=\"1pjjevm\" data-start=\"2830\" data-end=\"2885\"\u003eLower operating temperatures help improve reliability\u003c\/li\u003e\n\u003cli data-section-id=\"17ktdeh\" data-start=\"2886\" data-end=\"2942\"\u003eEasy replacement for many existing compressor packages\u003c\/li\u003e\n\u003cli data-section-id=\"151wrpk\" data-start=\"2943\" data-end=\"2997\"\u003eIdeal foundation for custom-built compressor systems\u003c\/li\u003e\n\u003cli data-section-id=\"17ymwz7\" data-start=\"2998\" data-end=\"3075\"\u003eGenuine OEM quality from one of the industry's most respected manufacturers\u003c\/li\u003e\n\u003cli data-section-id=\"b00eb5\" data-start=\"3076\" data-end=\"3121\"\u003eSimple maintenance and dependable operation\u003c\/li\u003e\n\u003cli data-section-id=\"16zyydx\" data-start=\"3122\" data-end=\"3178\"\u003eBuilt for continuous commercial and industrial service\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3180\" data-end=\"3183\"\u003e\n\u003ch1 data-section-id=\"8ocrhd\" data-start=\"3185\" data-end=\"3218\"\u003eBest For \/ Typical Applications\u003c\/h1\u003e\n\u003cp data-start=\"3220\" data-end=\"3252\"\u003eThe FS-Curtis ES50 is ideal for:\u003c\/p\u003e\n\u003cul data-start=\"3254\" data-end=\"3533\"\u003e\n\u003cli data-section-id=\"53wmjl\" data-start=\"3254\" data-end=\"3279\"\u003eAutomotive repair shops\u003c\/li\u003e\n\u003cli data-section-id=\"uvb1fs\" data-start=\"3280\" data-end=\"3310\"\u003eFleet maintenance facilities\u003c\/li\u003e\n\u003cli data-section-id=\"swliuf\" data-start=\"3311\" data-end=\"3333\"\u003eTire service centers\u003c\/li\u003e\n\u003cli data-section-id=\"er1wnc\" data-start=\"3334\" data-end=\"3352\"\u003eHVAC contractors\u003c\/li\u003e\n\u003cli data-section-id=\"pq5ogs\" data-start=\"3353\" data-end=\"3375\"\u003eManufacturing plants\u003c\/li\u003e\n\u003cli data-section-id=\"7jmu31\" data-start=\"3376\" data-end=\"3395\"\u003eWoodworking shops\u003c\/li\u003e\n\u003cli data-section-id=\"x6vzws\" data-start=\"3396\" data-end=\"3411\"\u003eCNC equipment\u003c\/li\u003e\n\u003cli data-section-id=\"d2lu6v\" data-start=\"3412\" data-end=\"3437\"\u003eAgricultural operations\u003c\/li\u003e\n\u003cli data-section-id=\"b5ztl1\" data-start=\"3438\" data-end=\"3474\"\u003eIndustrial maintenance departments\u003c\/li\u003e\n\u003cli data-section-id=\"1abb0he\" data-start=\"3475\" data-end=\"3503\"\u003eCustom compressor builders\u003c\/li\u003e\n\u003cli data-section-id=\"11tr0ms\" data-start=\"3504\" data-end=\"3533\"\u003eCompressor rebuild projects\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3535\" data-end=\"3538\"\u003e\n\u003ch1 data-section-id=\"zjxypn\" data-start=\"3540\" data-end=\"3566\"\u003eTechnical Specifications\u003c\/h1\u003e\n\u003cdiv class=\"TyagGW_tableContainer\"\u003e\n\u003cdiv class=\"group TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\"\u003e\n\u003ctable data-start=\"3568\" data-end=\"3988\" class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead data-start=\"3568\" data-end=\"3593\"\u003e\n\u003ctr data-start=\"3568\" data-end=\"3593\"\u003e\n\u003cth data-start=\"3568\" data-end=\"3584\" data-col-size=\"sm\" class=\"last:pe-10\"\u003eSpecification\u003c\/th\u003e\n\u003cth data-start=\"3584\" data-end=\"3593\" data-col-size=\"sm\" class=\"last:pe-10\"\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody data-start=\"3620\" data-end=\"3988\"\u003e\n\u003ctr data-start=\"3620\" data-end=\"3648\"\u003e\n\u003ctd data-start=\"3620\" data-end=\"3635\" data-col-size=\"sm\"\u003eManufacturer\u003c\/td\u003e\n\u003ctd data-start=\"3635\" data-end=\"3648\" data-col-size=\"sm\"\u003eFS-Curtis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3649\" data-end=\"3665\"\u003e\n\u003ctd data-start=\"3649\" data-end=\"3657\" data-col-size=\"sm\"\u003eModel\u003c\/td\u003e\n\u003ctd data-start=\"3657\" data-end=\"3665\" data-col-size=\"sm\"\u003eES50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3666\" data-end=\"3690\"\u003e\n\u003ctd data-start=\"3666\" data-end=\"3680\" data-col-size=\"sm\"\u003ePart Number\u003c\/td\u003e\n\u003ctd data-start=\"3680\" data-end=\"3690\" data-col-size=\"sm\"\u003eFES50B\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3691\" data-end=\"3733\"\u003e\n\u003ctd data-start=\"3691\" data-end=\"3703\" data-col-size=\"sm\"\u003ePump Type\u003c\/td\u003e\n\u003ctd data-start=\"3703\" data-end=\"3733\" data-col-size=\"sm\"\u003eSingle-Stage Reciprocating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3734\" data-end=\"3766\"\u003e\n\u003ctd data-start=\"3734\" data-end=\"3754\" data-col-size=\"sm\"\u003eHorsepower Rating\u003c\/td\u003e\n\u003ctd data-start=\"3754\" data-end=\"3766\" data-col-size=\"sm\"\u003e5-7.5 HP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3767\" data-end=\"3792\"\u003e\n\u003ctd data-start=\"3767\" data-end=\"3783\" data-col-size=\"sm\"\u003eConfiguration\u003c\/td\u003e\n\u003ctd data-start=\"3783\" data-end=\"3792\" data-col-size=\"sm\"\u003eBasic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3793\" data-end=\"3828\"\u003e\n\u003ctd data-start=\"3793\" data-end=\"3811\" data-col-size=\"sm\"\u003eOperating Speed\u003c\/td\u003e\n\u003ctd data-start=\"3811\" data-end=\"3828\" data-col-size=\"sm\"\u003e500-1,000 RPM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3829\" data-end=\"3860\"\u003e\n\u003ctd data-start=\"3829\" data-end=\"3854\" data-col-size=\"sm\"\u003eFlywheel Configuration\u003c\/td\u003e\n\u003ctd data-start=\"3854\" data-end=\"3860\" data-col-size=\"sm\"\u003e2A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3861\" data-end=\"3891\"\u003e\n\u003ctd data-start=\"3861\" data-end=\"3878\" data-col-size=\"sm\"\u003eDischarge Size\u003c\/td\u003e\n\u003ctd data-start=\"3878\" data-end=\"3891\" data-col-size=\"sm\"\u003e3\/4\" BSPP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3892\" data-end=\"3921\"\u003e\n\u003ctd data-start=\"3892\" data-end=\"3907\" data-col-size=\"sm\"\u003eOil Capacity\u003c\/td\u003e\n\u003ctd data-start=\"3907\" data-end=\"3921\" data-col-size=\"sm\"\u003e1.5 Quarts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3922\" data-end=\"3966\"\u003e\n\u003ctd data-start=\"3922\" data-end=\"3947\" data-col-size=\"sm\"\u003eDimensions (L × W × H)\u003c\/td\u003e\n\u003ctd data-start=\"3947\" data-end=\"3966\" data-col-size=\"sm\"\u003e19\" × 24\" × 17\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3967\" data-end=\"3988\"\u003e\n\u003ctd data-start=\"3967\" data-end=\"3976\" data-col-size=\"sm\"\u003eWeight\u003c\/td\u003e\n\u003ctd data-start=\"3976\" data-end=\"3988\" data-col-size=\"sm\"\u003e157 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr data-start=\"3990\" data-end=\"3993\"\u003e\n\u003ch1 data-section-id=\"eev796\" data-start=\"3995\" data-end=\"4027\"\u003eWhy Choose the FS-Curtis ES50?\u003c\/h1\u003e\n\u003cp data-start=\"4029\" data-end=\"4254\"\u003eWhen replacing a compressor pump, durability matters. The ES50 is engineered for long-term reliability using industrial-grade cast iron components and a slow-speed operating design that reduces heat buildup and internal wear.\u003c\/p\u003e\n\u003cp data-start=\"4256\" data-end=\"4453\"\u003eWhether you're restoring an existing compressor or assembling a custom package, the ES50 provides the proven performance and build quality professionals have trusted from FS-Curtis for generations.\u003c\/p\u003e\n\u003chr data-start=\"4455\" data-end=\"4458\"\u003e\n\u003ch1 data-section-id=\"slm0du\" data-start=\"4460\" data-end=\"4506\"\u003eWhy Buy from Compressed Air Advisors Online?\u003c\/h1\u003e\n\u003cp data-start=\"4508\" data-end=\"4756\"\u003eCompressed Air Advisors Online specializes exclusively in industrial compressed air equipment. Our experienced team helps customers select the correct replacement pumps, compressors, dryers, filters, and accessories for virtually every application.\u003c\/p\u003e\n\u003cp data-start=\"4758\" data-end=\"4797\"\u003eWhen you purchase from us, you receive:\u003c\/p\u003e\n\u003cul data-start=\"4799\" data-end=\"5032\"\u003e\n\u003cli data-section-id=\"1jd1uka\" data-start=\"4799\" data-end=\"4825\"\u003eExpert technical support\u003c\/li\u003e\n\u003cli data-section-id=\"11elp26\" data-start=\"4826\" data-end=\"4858\"\u003eGenuine FS-Curtis OEM products\u003c\/li\u003e\n\u003cli data-section-id=\"1i6rd5z\" data-start=\"4859\" data-end=\"4880\"\u003eCompetitive pricing\u003c\/li\u003e\n\u003cli data-section-id=\"b607p2\" data-start=\"4881\" data-end=\"4907\"\u003eFast nationwide shipping\u003c\/li\u003e\n\u003cli data-section-id=\"rtx4hu\" data-start=\"4908\" data-end=\"4960\"\u003eKnowledgeable assistance before and after the sale\u003c\/li\u003e\n\u003cli data-section-id=\"1vdixvz\" data-start=\"4961\" data-end=\"5032\"\u003ePersonalized recommendations for replacement and upgrade applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"5034\" data-end=\"5165\"\u003eIf you're unsure whether the ES50 is the correct replacement for your compressor, our compressed air specialists are happy to help.\u003c\/p\u003e\n\u003chr data-start=\"5167\" data-end=\"5170\"\u003e\n\u003ch1 data-section-id=\"hkd5a4\" data-start=\"5172\" data-end=\"5200\"\u003eFrequently Asked Questions\u003c\/h1\u003e\n\u003ch3 data-section-id=\"1oeo7vs\" data-start=\"5202\" data-end=\"5250\"\u003eIs the FS-Curtis ES50 a complete compressor?\u003c\/h3\u003e\n\u003cp data-start=\"5252\" data-end=\"5401\"\u003eNo. The ES50 is a \u003cstrong data-start=\"5270\" data-end=\"5294\"\u003ebare compressor pump\u003c\/strong\u003e only. It does not include the electric motor, air tank, belt guard, pressure switch, or mounting hardware.\u003c\/p\u003e\n\u003ch3 data-section-id=\"8yfw7c\" data-start=\"5403\" data-end=\"5455\"\u003eWhat horsepower motor is this pump designed for?\u003c\/h3\u003e\n\u003cp data-start=\"5457\" data-end=\"5540\"\u003eThe ES50 is designed for compressors using \u003cstrong data-start=\"5500\" data-end=\"5539\"\u003e5 to 7.5 horsepower electric motors\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3 data-section-id=\"czsexl\" data-start=\"5542\" data-end=\"5588\"\u003eIs this an OEM FS-Curtis replacement pump?\u003c\/h3\u003e\n\u003cp data-start=\"5590\" data-end=\"5661\"\u003eYes. Part number \u003cstrong data-start=\"5607\" data-end=\"5617\"\u003eFES50B\u003c\/strong\u003e is a genuine FS-Curtis OEM compressor pump.\u003c\/p\u003e\n\u003ch3 data-section-id=\"yhp46h\" data-start=\"5663\" data-end=\"5703\"\u003eWhat type of compressor is the ES50?\u003c\/h3\u003e\n\u003cp data-start=\"5705\" data-end=\"5822\"\u003eThe ES50 is a \u003cstrong data-start=\"5719\" data-end=\"5769\"\u003esingle-stage reciprocating air compressor pump\u003c\/strong\u003e designed for industrial and commercial applications.\u003c\/p\u003e\n\u003ch3 data-section-id=\"zy72ad\" data-start=\"5824\" data-end=\"5872\"\u003eWhat discharge connection does the ES50 use?\u003c\/h3\u003e\n\u003cp data-start=\"5874\" data-end=\"5933\"\u003eThe pump features a \u003cstrong data-start=\"5894\" data-end=\"5932\"\u003e3\/4-inch BSPP discharge connection\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3 data-section-id=\"12qvly\" data-start=\"5935\" data-end=\"5976\"\u003eWhat RPM should this pump operate at?\u003c\/h3\u003e\n\u003cp data-start=\"5978\" data-end=\"6034\"\u003eThe recommended operating speed is \u003cstrong data-start=\"6013\" data-end=\"6033\"\u003e500 to 1,000 RPM\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3 data-section-id=\"1c3wqn9\" data-start=\"6036\" data-end=\"6090\"\u003eCan this pump replace another brand of compressor?\u003c\/h3\u003e\n\u003cp data-start=\"6092\" data-end=\"6238\"\u003eIn many cases, yes. Compatibility depends on mounting dimensions, pulley ratio, flywheel configuration, motor horsepower, and system requirements.\u003c\/p\u003e\n\u003ch3 data-section-id=\"1aqzxf5\" data-start=\"6240\" data-end=\"6260\"\u003eIs oil included?\u003c\/h3\u003e\n\u003cp data-start=\"6262\" data-end=\"6300\"\u003eNo. Compressor oil is sold separately.\u003c\/p\u003e\n\u003cul\u003e\u003c\/ul\u003e","brand":"FS Curtis","offers":[{"title":"Default Title","offer_id":39391072452678,"sku":"FES50B","price":2099.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0014\/6237\/0374\/products\/e15c_fda1c962-fa65-4b79-b19c-471e3aa9b349.jpg?v=1625766255","url":"https:\/\/www.compressedairadvisors.com\/products\/fs-curtis-es50-bare-pump-5-7-5-hp","provider":"Compressed Air Advisors Online, Inc. ","version":"1.0","type":"link"}