Action pump 5:1 oil pump 22752 – ideal for shops & overhead reel systems most popular medium pressure pump for the larger oil distribution system and higher viscosity oils. Suitable for connection to a bulk tank or drum. Double acting air operated pump for oil and non-corrosive liquids. Includes a 2″ bung adapter. extra quiet design. 1/4″ air inlet 3/4″ discharge. Maximum air pressure of 145 p.s.i. And a working pressure of 100 p.s.i.