I made my own out of a 'sports bottle', three tire valve stems, some tubing, and a spare cap for the master. Put a stem in the top and bottom of the bottle and in the cap for the master. I took out all the valve cores. Run tubing from the bottom of the bottle to the cap. Fill with fluid, sael bottle and attach air hose from air compressor to valve in top of bottle. I haven't exceeded 14psi and it works real well.