About Us : Hofmann Fluid Power serve the fluid power industry. We offer standard and custom machined hydraulic and pneumatic parts in stainless steel, brass, electroless nickel and chrome since 1950. In 2007 we are featuring six balls in each of our couplers. This will vastly improve excess vibrations and help distribute the force of the plug against six contact points (not three) , helping to prevent the balls from denting the plugs and becoming lodged in the coupler.