ML80H horizontal captive air pressure tank with replaceable EPDM bladder and 100 psi maximum working pressure (tested to 150 psi), no water/air contact, rust-free operation, no air volume control needed and no waterlogging. 20 gal capacity with 7.5 gal of draw-down performance who equals to an equivalent 42 gal galvanized tank. 1 in NPT connection. Rated at 30 lb (144 kg).