This Perlick Lo-Boy D System Keg Coupler features a unique low profile design that makes it the perfect keg tapping kit for applications where vertical space is limited. Compatible with all domestic brand American "D" system sankey kegs, this coupler has a 55-psi pressure relief valve and a 304 stainless steel construction. Tapping a keg is easy - simple push down and turn to properly couple the keg.