The APEX ISF Series pumps are an end suction pump conforming to ISO 2858 and ISO 5199. Ideal pumping solution for demanding applications such as refinery, chemical process and many industrial applications. High efficiency design with low net positive suction head requirements. Cast iron pumps are capable of a working pressure of 16 bar. With higher rated flanges, cast steel and stainless steel pumps can be supplied for higher working pressures. All pumps are hydrostatically tested to 1.5 times the rated working pressure.