The deal with me thinkn about parker valves is a friend of mine has gone an done some overhead door service work at a semi-local Parker-Hannifin plant and asked if we could buy valves from them. He was told that we could supposedly get the valves for somewhere around $10 a piece. My valves would prolly be going back into the same spot where the radio is factory, cause I've had problems with my M.I.C. manual valves since its gotten cold.