MADE FROM BRASS Bottle MUST be EMPTY if no 80% shut off valve fitted (refueling without non-return valve you must close the bottle valve first before disconnecting gun after refuelling!!!) If you dont know how to use it, please dont buy it This adaptor may be used on gas bottles, with LEFT HAND 5/8" thread fitting which can be used for additional adaptors fill up anywhere in EU. We do not take any responsibility for improper use of offered products. . .