This ARO Thunder Series 3:1 Air-Operated Oil Pump ensures consistent operation for transferring oil and light lubricants. The pump features a stall-free, ice-free air motor with only 3 working parts and can be serviced in-line. The patented design delivers great flow, minimized pulsation and an extended service life. Other features include a maximum 6 GPM working flow rate, a 1/4in. NPTF air inlet, and a 3/4in.-1/2in. NPTF fluid inlet/outlet. This pump fits 55-gallon containers and includes a 2in. bung adapter.