| Product Line | Brakes |
| Category Name | Air Brake Valves |
| Part Type | Relay Valve |
| Alternate Part Name | Emergency Relay Trailer Valve |
| OEM Part Number | KN30300 |
| Application Type | Semi-Trucks, Heavy Duty Trucks |
| Compatible Repair Kit Part Number | F224646 |
| Delivery Port Qty | 4 |
| Delivery Port Size | 1/4 in-18 |
| Emergency Supply Port Size | 1/4-18 NPT |
| Service Port Size | 1/4-18 NPT |
| Supply Port Size | 3/4-14 NPT |
| Material | Die-cast Aluminum |
| Crack Pressure | 4.5 psi |
| Minimum Operating Temperature | -40 deg. F (-40 deg. C) |
| Net Weight | 3.20 lb. |
| Cross References | 170KN30300, 281860, 281860N, 5396-KN30300, 5396KN30300, EBN281860N, EM36350, KN30300, KN30300N, R955281860N, S281672, ZZKN30300 |
| Intended Application | - Air Brake Systems: For trailers older than 121, converter platforms or exempt trailers.
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