The S-series vacuum pump is an electric, straight through, bellows type pump. It is manufactured of long lasting polypropylene, draws 2 to 6 amps at 12 volts. It can be mounted up to 20 feet away from the vacuum tank but must be mounted right side up. The bellows style allows it to be run dry without damage. Weight: 8 lbs. Inlet and outlet connections: 1-1/2" hose barb.