2.Fits various size inflatable lifejackets with 33 gram CO2 cylinder with 1/2” thread cylinder. 3.Flotation: 33g=150N 33G / 150N / Adult ⇌ The gas in the cylinder is 33 gram 1/2-inch thread which offers buoyancy of 110N, suitable for the neck type of Eyson Inflatable life jacket for adult.