[arcticdude]

There could be a ppv at each air tank and one in the accessory air system (pocket doors, etc and air compressor). Any system that's tied to the main air system will have a ppv between it and the main system. They should really be considered a maintenance item and I do need to replace mine.


I've been told that if they're in a tight location and if you can source the original, you can take the four screws out of the tophat, swap out the guts after ensuring its clean and put the tophat back on. Supposedly there's no reason to remove the main body.