Hi All, My compressor Hydrovane 7 series is leaking from behind the air filter. I had a look, removed air filter and a cover behind that and it seemed to be coming from some sort of inlet air valve with a plastic washer on it. I replaced the O rings and plastic washer but hasn't helped. Does anyone know anything about these valves, it seems to just float in and out freely? Hope someone can help please. Many thanks.