0383542 (Watts) | 1 1/2 In Iron Boiler Pressure Relief Valve | 30 psi | Expanded OutletsThis 1 1 2 Inch Boiler Pressure Relief Valve is Used in Hot Water Space Heating Boiler Applications to Protect Against Excessive Pressure on All Types of Hot Water Space Heating Boiler Equipment. It Consists of an Iron Body Construction With Expanded Outlet Drain Connections For Hot Water Space Heating Boilers, Non Metallic Disc To Metal Seating, Stainless Steel Spring, And Test Lever. It Offers Large Discharge Capacity, Resists Corrosive Water