Spud Gun Drilling of Clean Out Cap

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Note that I no longer recommend using this type of cap in a hi-press. air cannon.

The large hole in the center is tapped for a 1" pipe nipple. This is where I attached the Solenoid Valve. The small hole is tapped for a 1/8" npt. This is where I attached the Air Gauge Air Fill assembly.

Sorry, but there is no exact placement of the 1/8 npt hole. Just place it where it will work best with what you have to work with. I think mine just did scrape the inside wall of the threads.

You can get a clean out cap made of pvc. or brass. I used pvc, so far with no problems.

It is rated at 200 psi. max. This type is called a "Tank Valve" for use on compressed air tanks.On the left side is your common valve nipple, like on a car tire, the air goes in this side.On the right side it has a pipe thread or 1/8" npt thread. A npt thread gets tighter the farther you screw it in, to make an air tight connection. Click here to see the package it came in.

This is another type shrader valve. Is designed for a car tire. Shown are the valve with inside rubber gasket,outer rubber gasket ,clamping washer,clamping nut and cap. I personally have not used this type. I would NOT recommend mounting it through the wall of the pipe used for the air chamber, because it would cause a weak spot in the pipe. Others have mounted this in the center of a " cap" on one end of the air chamber with good results.

Because of a weakness found in using the threaded caps to hold the solenoid valves. I have redesigned this part of the gun.

I think have found a fix for the problem of the 4" clean out cap's cracking or exploding using off the shelf parts. What I did was to get a 4" threaded male adapter to screw into the clean out or female threaded adapter , into this I glued a 4" X 2" adapter bushing. into the adapter bushing I glued a 2" <slip fit> X 1" threaded bushing. Now I can screw a 1" steel nipple into this and attach my valve as usual. This adds a little more air volume to the area behind the piston , but it was easy to make and get the parts. and should work well and not blow out. Patrick Parsons.

Last night or was it early this morning?..... I drilled the end cap to accept a 1" threaded nipple to attach my solenoid valve. This time I tried something diff. I used a slightly longer nipple and drilled it in the center to accept two 1/8 NPT. fittings.... the air fill valve and the gauge. .the other cap cracked.... I am surprised it did not blow off! Below is a crud drawing of how I drilled the 1" steel nipple to accept the Shrader Valve and Air Gauge. The nipple is used to attach the solenoid valve to the air cannon. NOTE that you can drill a 1/4" NPT hole for the air gauge if the gauge you use has a larger thread. Use the shortest nipple that will work with the parts you have. I think the one I used was 2" long, it was a tight fit, but it all when together nicely.

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