The KOMOS stainless S-Style coupler is built for European brand kegs including Heineken, Newcastle, Pilsner Urquell, and Stella Artois. Featuring stainless steel body and stainless steel probe, this keg tap is made to last. The coupler comes without fittings so it can be adapted however you sees fit. When assembling, insert the rubber "duck bill" check valve into the side gas-in port. The check ball and ball retainer are placed in the top beverage-out port.