"Occasionally the o-ring in the neck of the propane tank is compressed by its retaining ring and doesn't correctly fit the stem of the Propane Adaptor nozzle.
The tank gauge on the adaptor can be used to verify a tank before purchase."
Saskatchewan Age Verifier! Contact for more Info.
http://airsoftcanada.com/showthread.php?t=174161 - Honour & Respect your fellow players! #Airsofthonourandrespect