5" RIV Cast Iron Knife Gate Valve Unidirectional Double Acting Pneumatic Actuator AGRI Standard and PN10. RIV123The 5" RIV Cast Iron Knife Gate Valve offers reliable performance with its double acting pneumatic actuator, AGRI standard, and PN10 rating. Its unidirectional design ensures efficient flow control, making it ideal for a variety of industrial applications. Durable and efficient, this valve is a quality choice for any project. To suit PN10 and AGRI Standard Square Flanges 4 Hole Cast Iron Body Stainless Steel Blade NBR Gaskets Fully Enclosed for Safety