We design this convert lid to make any container with 3" Tri Clamp opening to be a ball lock keg.
This lid comes with beer post, gas post, pressure relief valve, just attach the silionce hose to the end of the beer post, then it works the same as a cornelius ball lock keg.
Also this lid is ideally suited to also fermenting under pressure so you can use a spunding valve so you can naturally carbonate during primary fermentaion.
The max pressure: 2.5 bar (36 psi)
Please depressurize before removing lid.