The CH5004SS is a D System Lever Style Keg coupler with a stainless steel probe. Designed for maximum flow, this keg coupler can be used for either single or series keg dispensing. Made for American D systems. A high-capacity pressure relief valve has been incorporated as an integral part of the coupler body. This serves two purposes: first, when functioning with other relief devices in the system, it will prevent a keg from reaching pressures in excess of recommended working pressure. Secondly, it allows the user to relieve pressure when needing to prevent or correct dispensing problems.