I just watched Rich's video (AoA) on all the different methods of filling an air tank, but he did not say whether you can connect your female foster fitting hose from the compressor directly to the male fitting on the HP3 vlave on the tank. If you can fill that way, was is the proper sequence to pressurize the line? Open the HP3 valve first then start the compressor or start the compressor first and pressurize the line until it is close to equal with the tank pressure then open the tank valve. Anyone?