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You're welcome

If you have a tap just thread it for 3/8" npt on the one you have

Order 228417RX. Shows to have a threaded exhaust port

Post a pic of what you have? The new part i mean @fuzzytoaster had an issue awhile back getting the correct one, due to its design I can't find his old thread though

Replace it

No tools needed. You have air leaking to the intake stack. Only certain air valves on the truck vent there. Q2 Valve, front and rear relay valves over the axles, brake pedal valve, transfer case interlock solenoid, R4 valve in the step. Basically the lines going into the block in the...

Several active threads the past month on this. Everything from treadle valves to relay valves. Simple way to do this is to figure out which tank is leaking down and attack the appropriate system that way. If the secondary side is dropping pressure start at the Q2 valve in front of the steer...