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The OP-7-P is a portable oil change system mounted to an easy-carry base. The pump is ideal for completing oil changes on generators and boat engines. Flow direction is reversible with the integrated switch. Reversible: Transfers hot or cold oil quickly and cleanly to and from the oil pan3' x 1/2" I.D. hose is put in new/used oil container5' x 5/8" I.D. hose with 3/4" female garden hose connects to engine dipstick tubeIncludes 1/4" female NPT adapter to connect to oil pan hose on some models of Mercury gas inboard engines