Dresser series 400 unloader valve plumbing ???
I just bought a used dresser series 400 air compressor and Im not sure how to hook up the unloader valve plumbing...
right now it has the two unloader valves one in each head plumbed into a t and then plumbed down into the top of what I understand is the oil pump/unloader valve diaphragm ....
and in that square diaphragm box there is one threaded fitting that goes out the front and one that goes out the bottom with nothing on them??
anyone know where these two fittings should be plumbed to?
Right now the unloaders do nothing.
Not a very good pic, will upload more after work
Actually, no photo came in with this post.