There is a pressur gauge at the pump and it reads 20 psi at the air dryer and when it comes out of there it reads 10 psi at the other pressure gauge. The distance from the garage to the pond is aprox 30 yards, then it T's and I have 2 valves one for each diffuser. The diffusers are spread out from there aproximently 30 yards apart and from shore. The compressor is warm but not hot. When I start the compressor up, it will go to 30 psi before it blows off and then remains at a steady 10 psi .