The Masterline 5000A-2 & 6000A-2 electric booster pump is used for compressing air, helium, nitrogen, or any other non-corrosive / non-explosive gas. It allows users to fill cylinders up to 4,500 psi from a low pressure supply cylinder for the 5,000A-2, and 6,000 psi for the 6000A-2. Due to it's innovative seal design and cooling method, Masterline boosters fill 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.