The ultimate in keg gas system protection is here.
Check Valved Gas Ball Lock Disconnect
This disconnect has an internal check valve that will allow the gas to flow out, but won’t allow backflow of liquid back into your system.
Internal Check Valve protects your system from liquid back flow!
Made in Germany and assembled in the USA by CMB.
Extremly high quality for years of service.
NSF Approved for Food Grade Service!
Requires John Guest style push fit coupler to connect to the CO2 line. located here in 5/16 (8mm) or here if you use heavy duty 3/8" gas lines