| Product Line | Brakes |
| Category Name | Air Brake Valves |
| Part Type | Relay Valve |
| Alternate Part Name | Emergency Relay Valve |
| OEM Part Number | A1000S |
| Application Type | Semi-Trucks, Heavy Duty Trucks |
| Compatible Repair Kit Part Number | F224644 |
| Control Port Size | 1/4-18 NPT |
| Control Port Qty | 2 |
| Delivery Port Qty | 4 |
| Delivery Port Size | 1/4 in. NPT |
| Emergency Supply Port Size | 1/4-18 NPT |
| Supply Port Size | 1/2-14 NPT |
| Material | Die-cast Aluminum |
| Crack Pressure | 1.5 psi |
| Minimum Operating Temperature | -40 deg. F (-40 deg. C) |
| Net Weight | 5.10 lb. |
| Cross References | 170.A1000, 229859, 229860, 7546-A1000S, 7546A1000S, A1000S, EM36180, LEV-3618, LEV3618, RSLA1000S |
| Intended Application | - Heavy vehicle air brake systems, particularly those manufactured before the implementation of the FMVSS 121 standard. Its main function is to combine the characteristics of a relay valve and an emergency valve, ideal for applications where safe braking and rapid response in emergency situations are required.
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