I have the Kegco stainless CFC and used the 15MM to 1/2 NPT (of course after also purchasing the 5/8” to 1/2 NPT adapters because these CFCs are falsely advertised as 5/8” tubing) adapters from AIH and they DID NOT SEAL. I tried to seal them 1/4 turn at a time until the nut was completely...