Replacement cartridge set 38g for SECUMAR lifejackets consisting of a CO? cartridge, two release tablets and, if necessary, safety pins. SECUMAR replacement cartridges are available in two versions: with bayonet and with screw thread. Bayonet cartridges are used in the SECUMATIC 4001S and SECU 401S inflators and have the suffix 'dock' in their name. Cartridges with screw thread are used in the inflators SECUMATIC 3001S, SECU 301SM and SECU S31. In addition, the filling quantity of the replacement cartridges in CO? is relevant. This is given in grams (g) and is determined by the buoyancy chamber size of your lifejacket.