BACKinMACK Posted January 12, 2022 Share Posted January 12, 2022 (edited) Hello, I am replacing the treadle valve in my 1999 MACK RD688S dump truck. I believe it is original. The air line fittings are a mix of push to fit and compression. The two larger 1/2" lines are compression, the balance being five 3/8"lines, and one 1/4"line are push to fit. Can I replace the 1/2" compression with 1/2" push to fit? Or is there a reason those are compression? All piping to and from valve are plastic. I just added pictures. Can anyone tell me what the piece is to the left plumbed into the top section. I am guessing a check valve? Maybe a pressure regulator? Thanks in advance for any help. Edited January 12, 2022 by BACKinMACK left out piping material ,add pics Quote Link to comment Share on other sites More sharing options...
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