Suitable for Crewfit 165N Sport Automatic and 150N Junior Automatic. CO2 Cylinders Crewsaver CO2 cylinders are available in & amp; For the following: 23g cylinder - for junior crewfit & amp; Teviot Lifejackets 33g CYLINDER - For CREWSAVER 150N & AMP; 165n Lifejackets 38G CYLINDER - For CREWSAVER 180N & AMP; 190n Lifejackets 60g Cylinder - For Crewsaver 275n & amp; 290n Lifejackets