The Masterline 7000A-2 electric booster pump is used for compressing 100% pure oxygen. It allows users to fill oxygen cylinders up to 3,500 psi from a low pressure supply cylinder (4,500 psi version is available). Due to it's innovative seal design and cooling method, Masterline boosters fill oxygen cylinders near ambient temperature. Our boosters also operate at a very low 77 dBa noise level. An optional vacuum pump is available as well as several other customizable options.