★ Stainless Steel Body ★ The Keg Coupler's Body is made of 304 stainless steel that will not wear away over time and it will not chip like a chrome keg couple. It can improve durability and resistance to chemicals. ★ Stainless Steel Probe ★ The Stainless Steel Keg Coupler's Probe is made of stainless steel that for maximum durability and sanitation, for the ultimate in purity excellent for beer, wine, and cider. ★ Tap For American Kegs Or Sankey Keg ★ The beer keg coupler is D - System keg taps. It fits perfectly into american kegs/sankey keg. Great sankey d coupler to replace old tap that was leaking and hard to get on. ★ Come With Two Tailpiece Set & Hose Clamp ★ The sankey keg coupler is G5/8 thread( U.S. Beer Industry Standard). This d coupler has a beer tailpiece to fit 5/16" ID hose. ★ With A Pressure Relief Valve ★ This keg coupler features a 53 PSI pressure relief valve with a food grade silicone O-ring to avoid relief valve leakage of the Keg coupler. "D" system is the most common system available in the U.S., also known as American Sankey. It is used by all the major breweries. How to use the beer keg coupler？ You also need a gas tank/regulator/beer faucet/hose to get the gas from the regulator to the coupler and dispense your beer. And then tap the sankey coupler to keg, pull the handle out and then down to lock How to check whether the sankey d keg coupler leaks or not？ The best way to check is to spray it with soapy water when it is under pressure and look for bubbles. There is a white lug under the gas in nipple that is held on by a hex nut. That prevents backflow into the regulator and also acts as a seal. It's possible that that hex nut is not tightened enough or that check valve is misaligned, causing a bad seal Features: System: D Keg Coupler Body Material: 304 Stainless steel Probe Material: 304 Stainless steel Handle Color: Black Handle Style: 304 Stainless steel - Lever Gas Port:(To fit 5/16" I.D. Gas Hose) Beer Port: 5/8" Thread (U.S. Beer Industry Standard) pressure relief valve: pressure relief valve releases at 55 PSI Short handle is ideal for the smaller diameter 1/6 kegs Package Includes: 1* 304 Stainless Steel Keg Coupler