Each D-series pump comes complete with a back to tank bypass valve and built-in strainer.Without disturbing the piping,the gear set and strainer screen can be serviced.Likewised,should the mechanical shaft seal assembly require replacement,the gear set dose not have to be removed from the pump.Each D-series pump uses a BUILT-IN bypass valve cartridge set at 90 psid.Pump bypass must be piped back to the supply tank.Designed for direct motor mount to 56C-frame electric motor.Foot mount available.