Thanks once again Mankster, but they were what I originally meant to use, I had heard somehwere that an adaptor (pressure reduction valve) could be fitted to the pump and that would reduce it to two or three bar? Innovations was the recommended one, but Halfords were out of stock, B*keh*t were given a defint thumbs down on two customer reviews I rea, What degree of difficulty would you rate the production of valves etc., I have a lathe and can use it