The NIBCO® multi-turn boiler drain is manufactured from dezincification resistant cast copper, with a Buna-N seat. Please refer to NIBCO® technical data sheets and catalogs for engineering and installation information. Choose NIBCO® flow control products for the most specified, versatile and economical option in commercial and residential applications. NIBCO® Boiler Drain Valves are backed by the NIBCO® 2 years limited warranty.