Shop › MTW 4” LF Cast Iron Epoxy Strainer Image 1 of 1 MTW 4” LF Cast Iron Epoxy Strainer $530.00 Strainers are designed to be used in potable cold water systems. Working pressure should not exceed 150 PSI.Full Spec Sheet Here. Add To Cart Added! Strainers are designed to be used in potable cold water systems. Working pressure should not exceed 150 PSI.Full Spec Sheet Here.