The Skin screw & Yoke configuration guards the stem & offer fast visual indicator of open/shut position. Bronze-to-bronze seating surfaces lock into a dovetailed groove inside the gate frame and disc, creating a restricted seal for very low leakage Just about every gate created with Finite Ingredient Examination which measures https://www.indusroof.com/kartar-cast-iron-sluice-valve-gate-valve-k504-100mm-4-inch