| Product Line | Brakes |
| Category Name | Air Brake Valves |
| Part Type | Relay Valve |
| Model | R-6 |
| OEM Part Number | 280375 |
| Application Type | Heavy Duty Trucks, Semi-Trucks |
| Compatible Repair Kit Part Number | F224741 |
| Delivery Port Qty | 3 |
| Delivery Port Size | 3/8-18 NPT |
| Exhaust Port Size | Dust Shield |
| Mounting Hole Qty | 2 |
| Mounting Holes Size | 0.41 in. |
| Service Port Size | 1/4-18 NPT |
| Supply Port Size | 1/2-14 NPT |
| Supply Port Qty | 1 |
| Material | Die-cast Aluminum |
| Crack Pressure | 2.0 psi |
| Maximum Operating Temperature | 200 deg. F (93 deg. C) |
| Minimum Operating Temperature | -40 deg. F (-40 deg. C) |
| Service Port Orientation | 270 deg. |
| Net Weight | 2.30 lb. |
| Cross References | 170280375, 2803.75R, 280375, 280375R, 280375X, EM36170, EM36820, KN28071, KN28140, LRV-3617, LRV3617, RKN28140 |
| Intended Application | - For air brake systems on trucks and heavy commercial vehicles.
- It is normally mounted at the rear of the vehicle, near the brake chambers it serves.
- It is used to improve braking response by reducing the distance and time of activation of air in the system.
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