Rated for water pressures between 40-60 PSI, this Ritchie(R) 1/2 inch valve reliably and efficiently regulates water flow. The red valve is standard valve in the following units: WaterMatic 100 & 150, Omni 1 & 2, Omni-2 Special, Pork Kings Series, and Thrifty King for Swine. | Ritchie Waterers Standard Valve | Size 1/2"