Off to France soon and will need to fill up on GPL while over there. How tight should the adaptors be screwed into the existing (bayonet) fitting? Long time since I filled up abroad and I seem to remember the fitting leaked last time I used it. I thought the ribber "O" ring had hardened with the temperature of the liquid gas and leaked. Wasn't in much of a position to do a detailed analysis as I just wanted to disconnect before something blew up!