Suction diffuser provides and ensures a uniform flow  pattern to the sutction side of the pump ensuring a stable NPHS. Suction diffuser makes it possible to install the pump in a very narrow spacing as no long bends are necessary. The suction diffuser incorporates a cylindrical strainer preventing impurities from entering the pump. Additional features include a disposable stainless stell start-up screen for capture and removal of foreign particulates in system piping and an adjustable support for mounting.