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Napa, part was in the parts cross reference located in 5ton forum.... Its a standard 65-75 psi ppv....28.00

NO, the valve was replaced...no cleanup, the needle and entire assy was frozen up and the rust was severe. the Valave is located on the Inlet of the Wet Tank....

After getting the new M931A2 and having a lousy 30.00 part cause so many issues...I took apart the old one, here are the pics. If they had used a stainless steel needle it may have prevented the unit from not working. this truck had only 4 hrs on it, everything new...this is what not draining...