I bought a 199? tot tub, don't know the manufacturer. I had a broken air control valve, and replaced both. Some of the Waterway, screw in jets were not putting out air. I placed a shop vac, set to discharge, over the air control, and air did come out of all the jets attached to that manifold. I removed some of the jets to clean. They adjusted hard, but were not stuck ,or clogged, with no missing o-rings. I put them back into the housing, and no air. I removed the air line from the manifold, and still no air to the jet.
Looking at one of the jets on the other manifold that was working properly, I turned the jet on and off, no air flow.
Will a jet wear-out, and not provide the necessary suction? Around the eye of the jets, there is about 1/8' clearance where I can see to the back of the jet.
Is it normal to have water in the airlines when the air control is closed?
Any help is greatly appreciated!!!