[MARKGMC3]

The method to my madness for making a schematic of the 12V air system was to break the system into circuits to make it easier and a more organized process for finding air leaks.  I'm using a leak down tester that has been discussed on the forum. 

So far I have determined that I have a very small air leak within the flush valve of the 1/2 bath toilet.  I will service that valve.

My pocket door is what I call air tight.  My standard for "air tight" is no leakage in an hour.

I have found a substantial air leak at the air cylinder of the right side dump valve.  The 90 degree push in fitting is leaking--it is the fitting itself, not where it screws into the cylinder or where the air line pushes in.  I'd like to change these plastic fittings to metal.  Dupree only has the plastic fittings and didn't know what the thread is.

Two questions:  Does any one know what the thread is that screws into the cylinder?  Does any one have a source for metal fittings?

IF THE PIPE SIZE IS 1/8" NPT, THAN THE ITEM # 11K674 IS THE PART U NEED FROM GRAINGER.COM
OR YOUR LOCAL GRAINGER STORE.

THEY ALSO HAVE THE SAME PART IN 1/4" NPT.

MARK