These cartridge style Johnson pumps are used on a lot of boats especially as live bait tank pumps. The beauty of them is if the motor fails you can leave all the base in there and just pop out the motor and connect up a new one and slot it back into the housing. The 600, 800 and 1000GPH pumps have a 19mm output and the 1150GPH pump has a 1" output. Height of pump is 100mm.