I installed a couple of air bags on my Colorado. Now I'm trying to run some air hoses to them and remote mount a fill (schrader) valve. There are lot of places I could mount the schrader but I would like to mount inside the bed up high near the tail light to keep it out of the normal road slop, mud, or snow. I frequently pull my 11,000 GVW trailer with my John Deere on a trailer in the winter snow and also in the summer to new construction sites which means lots of mud. So the exposure is there.

What I'm looking for is some type of schrader valve that I can bulkhead mount. I have tank valves like we use for air bags but they will not mount through a hole easily. What is needed is 1/4" airline (the same as we use for GMC air bags) in the back of the valve and some way to mount the valve in a hole drilled through the side / rear of the bed.

I can not find anything like this. Does anyone have any ideas and a source for two of these?
Basically I want a bulkhead mounted shrader that I can attach a 1/4" air line on the back side.