Is there typically a check valve on the air dryer line to the wet tank.....possible that marked in the attached photo?
Line 2 on the drawing. Not sure what the "i" means.
If it is a check valve, anybody have a part number?
That is one of several of the same Haldex check valves in the coach air system. ^.^d
Don
Should be 1/2" NPT in and out. Check the threads on yours to be sure. Either one (below) will work.
800372 by BENDIX - SC-3 Single Check Valve, Service New (https://www.finditparts.com/products/1712876/bendix-800372)
KN23000 by HALDEX - Check Valve - One-Way (https://www.finditparts.com/products/368717/haldex-kn23000)