Description
Manual fuel shutoff valve with one 1/2 in. SAE 45° flare port and one 3/8 in. NPT pipe port, used on Mack truck fuel-supply lines to isolate the tank when servicing the fuel filter, lift pump, or injection components. The PAI Industries MTV-4222 is a direct aftermarket replacement for Mack 20QE1184 and 6635-V409F86.
Specifications
| Manufacturer | PAI Industries |
|---|---|
| Part Number | MTV-4222 |
| Part Type | Manual Fuel Shutoff Valve |
| Port 1 | 1/2 in. SAE 45° Male Flare |
| Port 2 | 3/8 in. NPT Pipe |
| Operation | Manual quarter-turn |
Cross References
This valve replaces or is equivalent to the following part numbers:
- Mack: 20QE1184, 6635-V409F86
Applications
Universal fitment for Mack truck fuel systems specifying a 1/2 in. SAE 45° flare x 3/8 in. NPT manual fuel valve, including:
- Mack CH, CL, CV, RD, DM, and similar Class 8 chassis
- Fuel-tank isolation valves at the supply line takeoff
- Fuel-filter and lift-pump service shutoff points
Verify the existing valve’s port sizes (1/2 in. SAE 45° flare and 3/8 in. NPT) before ordering. Always purge fuel pressure before service.
