Help identifying part for replacement
93 Thomas Navistar international 3600 with dt 360. Need help identifying these valves on the bottom of my air tank. Two of them are leaking so I'm of course loosing pressure unnecessarily. Anyone know what would be the proper part name or number to get some replacements. Doesn't look like there is any way to service or tighten them. They are not leaking at the exit port but instead around the actual valve workings on either side. Thanks in advance.