Review on MRbrew All 304 Stainless Steel Keg Coupler: D System Beer Tap for 5/16'' Hose by Angel Gibson

Completely made of stainless steel. 304 stainless steel clips included. The part appears to be cast with machined joints. EDIT: I was so happy with the original that I bought another one for a second keg. Unfortunately, like the reviewer after me, the pressure relief valve was leaking. Luckily I caught it in less than a day but still lost some #CO2. In this case, I could hear it, so it wasn't much of a mystery. A good way to check for a gas leak in your system is to turn the main gas to the "on" position to charge the system. Then turn off the power again and monitor the readings from the sensors. If you have a leak you will see that one of the pressure gauges will lose pressure. From there you can isolate potential leaks with soapy water or isolate parts of your system.