4" RIV Cast Iron Knife Gate Valve - Unidirectional - Double Acting Hydraulic Actuator - AGRI Standard and PN10 - RIV124This 4" RIV cast iron knife gate valve is equipped with a unidirectional design and a double acting hydraulic actuator for efficient flow control. It meets both AGRI Standard and PN10 requirements. Experience dependable performance with this reliable valve. To suit PN10 and AGRI Standard Square Flanges 4 Hole Cast Iron Body Stainless Steel Blade NBR Gaskets Fully Enclosed for Safety, with Position Indicator Double Acting Hydraulic Actuator Operation.