| Product Line | Brakes |
| Category Name | Air Brake Valves |
| Part Type | Relay Valve |
| Model | R-12H |
| OEM Part Number | 103009 |
| Application Type | Semi-Trucks, Heavy Duty Trucks |
| Compatible Repair Kit Part Number | 5019003 |
| Delivery Port Qty | 2 |
| Delivery Port Size | 1/2-14 NPT |
| Exhaust Port Size | Dust Shield |
| Mounting Bracket Dimension | 0.96 in. x 0.40 in. |
| Mounting Hole Qty | 4 |
| Service Port Size | 1/4-18 NPT |
| Supply Port Size | 3/4-14 NPT |
| Supply Port Qty | 2 |
| Universal Mounting Bracket Included | Yes |
| Material | Die-cast Aluminum |
| Valve Body Configuration | 2 SUP / 2 DEL (H) |
| Crack Pressure | 4.0 psi |
| Maximum Operating Temperature | 200 deg. F (93 deg. C) |
| Minimum Operating Temperature | -40 deg. F (-40 deg. C) |
| Net Weight | 2.70 lb. |
| Cross References | 102537, 103009, 103009N, 1677541C91, 170103009, 20QE347, 745-103009, 745103009, EBN103009N, EM35960, KN28140, R955103009N |
| Intended Application | - For air brake systems of trucks, trailers and buses.
- Ideal for systems with spring brakes, where the anti-compounding function is crucial to avoid double brake application problems.
- Improves the efficiency of the brake system in heavy-duty and commercial vehicles.
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