| Product Line | Brake System |
| Category Name | Air Brake Valves |
| Part Type | Tractor Protection Valve |
| Alternate Part Name | Tractor Protection Valve with Double Check |
| Model | TP-3DC |
| OEM Part Number | 65706 |
| Application Type | Semi-Trucks, Heavy Duty Trucks |
| Auxiliary Supply Port Size | 1/4-18 NPT |
| Mounting Hole Qty | 2 |
| Mounting Hole Size | Ø .34 in. |
| Mounting Type | Cab / Chassis |
| Stop Light Switch Port | 1/4-18 NPT |
| Tractor Control Port (Primary) | 3/8-18 NPT |
| Tractor Control Port (Secondary) | 3/8-18 NPT |
| Tractor Protection Port | 1/4-18 NPT |
| Trailer Service Port Size | 1/2-14 NPT |
| Trailer Supply Port | 1/2-14 NPT |
| Material | Die-cast Zinc |
| Maximum Operating Temperature | 200 deg. F (93 deg. C) |
| Minimum Operating Temperature | -40 deg. F (-40 deg. C) |
| Service Line Shut-Off Pressure | 20 ± 5 psi |
| Net Weight | 1.44 lb. |
| Cross References | 065706, 170.KN34110, 2585506C91, 503139C91, 5396-KN34110, 5396KN34110, 990689C91, EM37140, KN34110, LPV-3714, LPV3714, N30162MA, N30162PA, RKN34110, ZZKN34110 |
| Intended Application | - Tractor protection valve with double check function. Its main application within the air brake system of heavy trucks is the protection of the tractor brake system.
- Prevents simultaneous activation of the service and spring brakes, avoiding trailer rollaway situations.
- Acts as a double check between the primary and secondary circuits of the tractor.
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