Hi thanks for the replies i have bought the hamilton bard beer adapter /sodastream bottle and as others have commented having varied results , with practice i should get more consistent results (i have plenty of co2 capsules and they work fine ) , most of the suppliers of genuine tau adapters seem to be overseas , whilst searching i found an interesting gun similar in many ways to the tau the mac 1 from the good old USA , we cant have them all can we . martin