| Product Line | Brakes |
| Category Name | Air Brake Valves |
| Part Type | Pressure Protection Valve |
| Model | PR-4 |
| OEM Part Number | KN31001 |
| Application Type | Heavy Duty Trucks, Semi-Trucks |
| Delivery Port Qty | 1 |
| Delivery Port Size | 1/4-18 NPT |
| Supply Port Size | 1/4 -18 NPT |
| Material | Die-cast Zinc |
| Closing Pressure | 45 psi |
| Crack Pressure | 65 psi |
| Maximum Operating Temperature | 200 deg. F (93 deg. C) |
| Minimum Operating Temperature | -40 deg. F (-40 deg. C) |
| Net Weight | 0.64 lb. |
| Cross References | 170.KN31000, 170KN31000, 20QE2128, 277146, 356596C91, EM36850, KN31001, LPR-3685, LPR3685, R90555396 |
| Intended Application | - Air brake systems on heavy and commercial trucks.
- Protection of secondary pneumatic circuits, such as air suspension, pneumatic clutch systems or auxiliary accessories.
- Prevents total loss of pressure in the event of a leak in a secondary circuit.
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