P-1500     ( Pond   unit ) Ponds up to 1,500 Gallons 1.25 inch Barb Fitting for easy slip-on to Flex hose   ------------or-                                1.25 inch M.P.T. Thread for hard plumb installation Overal Length = 23 inch   Round Diameter = 2.25inch Recommended Flow Rate   500 GPH  to  3,000 GPH Each POND unit has been internally insulated for winterized conditions. Built compact for both above or underground installations. MAINTENANCE: Recommended to clean internal sleeve once a year.