Low Profile Keg Coupler with Ball Lock Gas Beer Post All Stainless Steel 304 Homebrew Kegerator Space Saving Keg Valve Low Profile Keg Coupler with Ball Lock Gas Beer Post All Stainless Steel 304 A Keg Coupleris a key element of any draft beer system.The keg couplers job is to connect your CO2 tank to the keg so the gas can push the beer up through the beer line. This Keg Coupler is a high quality tap for those tight installations. It is superior quality tap and this low profile is ideal for tight keg rooms where space is a premium. This keg coupler only sticks up about inch above the rim of the keg. So youll have an easier time installing and operating your keg setup in limited space. With 100% stainless-steel contact, you can be sure that this beer coupler will last for a very long time, and that unwanted chemicals will not enter your beer and taint its quality. If your home draft system is a mix of ball lock kegs and commercial beer kegs, having a keg coupler with ball lock post is a huge plus. This allows you to have all your draft lines ending in a ball lock quick disconnect, making it quick and easy to swap lines from commercial beer keg to ball lock keg.