What is it and why would a Cuemaker have one ?

Well actually I have two. 




That is the valve body for a large air compressor.  I have 2 compressors wired together so that they act as one.  That way when one fails I still have some air.  Almost everything we do when making a cue requires compressed air.   That part failed and had to be replaced.  So I drove across town to buy this part, when I got ready to install it here.



The gaskets were broken, so I had to drive all the way back across town for good gaskets.  They also sold me the wrong intake filters,  so there is another drive in the future, the fix was $350 plus half a day.

DP