Prevost Flexair 3/8-Inch Air Hose with Coupler & Plug, 35/50 ft
The Prevost Flexair hybrid polymer air hose arrives fully assembled for compressed-air service. Choose a 35-foot or 50-foot length and the coupling profile that matches your tools and air supply.
COUPLER AND PLUG INCLUDED. Each assembly includes a prevoS1 quick safety coupling, matching plug and two protective sleeves. Select Industrial, High Flow or Automotive from the options above.
Which Coupler Profile Should I Choose?
The difference is the shape of the quick-connect fittings and how much air the coupler can pass. All six Flexair assemblies on this page use the same 3/8-inch hose inside diameter; changing the profile changes the supplied coupler and plug.
| Option | Connection and airflow | When to choose it |
|---|---|---|
| Industrial (ISO B) — ISI 06 | Industrial/ISO B quick-connect profile; 34 CFM coupler rating. | Choose this when your existing tools and air supply use matching Industrial fittings. |
| High Flow — ESI 07 | Larger internal air passage; 73 CFM coupler rating. Uses its own High Flow plug profile. | Choose this when your connections already use the matching High Flow profile, or when equipping a new system for air-hungry tools such as sanders, grinders and impact wrenches. |
| Automotive (Truflate) — USI 06 | Automotive/Truflate quick-connect profile; 34 CFM coupler rating. Different plug shape from Industrial. | Choose this when your existing tools and air supply use matching Automotive/Truflate fittings. |
These three profiles do not interchange. Match the hose’s included plug to your air-supply coupler, and match your tool plugs to the hose’s included coupler. A shared hose diameter or NPT thread size does not make different quick-connect profiles compatible.
For an existing shop: choose the profile already installed on your tools and air supply. If you are unsure, send us a clear photo or the part number of your existing fittings before ordering.
For a new setup: High Flow is a good choice when you want less coupling restriction for tools that consume more air. Standardize the mating fittings on the same compatible High Flow profile. It does not increase your compressor’s output.
“Automotive” names a fitting style. It does not mean this is the required option for working on cars. Select by fitting compatibility, not by the type of work you do.
About the airflow ratings: Prevost rates the ISI 06 and USI 06 couplers at 34 CFM, and the ESI 07 at 73 CFM, at 100 PSI with a 10 PSI pressure drop. These are coupler ratings, not guaranteed airflow through the complete hose assembly. Actual delivered airflow also depends on hose length, operating pressure and the rest of your air system. View Prevost’s coupling specifications.
Key Features
- Hybrid polymer construction combines properties of PVC and rubber.
- Lightweight, flexible hose that is easy to handle and coil.
- Non-scratch protection helps protect work surfaces.
- 3/8-inch hose inside diameter in both available lengths.
- Fully assembled with prevoS1 safety coupling and plug; no separate coupler purchase is required for the hose assembly.
Specifications
| Specification | Details |
|---|---|
| Manufacturer | Prevost |
| Product range | Flexair assembled extension hose |
| Hose material | Hybrid polymer |
| Medium | Compressed air |
| Hose inside diameter | 3/8 inch |
| Available lengths | 35 ft and 50 ft |
| Manufacturer stated operating pressure | 29–174 PSI |
| Included components | Hose, prevoS1 safety coupling, matching plug and two protectors |
Model Selection and Hose Dimensions
| Manufacturer part number | Coupler profile | Included coupling series | Hose inside diameter | Hose length |
|---|---|---|---|---|
| RST RISB3835 | Industrial (ISO B) | ISI 06 | 3/8 inch | 35 ft |
| RST RISB3850 | Industrial (ISO B) | ISI 06 | 3/8 inch | 50 ft |
| RST RESB3835 | High Flow | ESI 07 | 3/8 inch | 35 ft |
| RST RESB3850 | High Flow | ESI 07 | 3/8 inch | 50 ft |
| RST RUSB3835 | Automotive (Truflate) | USI 06 | 3/8 inch | 35 ft |
| RST RUSB3850 | Automotive (Truflate) | USI 06 | 3/8 inch | 50 ft |
The product photograph represents the Industrial assembly. Coupling appearance may vary with the selected profile.
Shipping and Availability
Contact Compressed Air Advisors for current availability and lead time. Free standard shipping on eligible domestic orders of $199 or more. Destination restrictions and expedited charges may apply.
Frequently Asked Questions
Does this hose include a coupler?
Yes. The prevoS1 safety coupler and matching plug are included. The hose is supplied fully assembled.
Which profile should I select?
Match your existing connection system: Industrial (ISI 06), High Flow (ESI 07), or Automotive (USI 06). Contact us if you need help identifying your fittings.
What sizes are available?
All six assemblies have a 3/8-inch hose inside diameter. Each profile is offered in 35-foot and 50-foot lengths.
Browse more air hoses and Prevost products.