The NIBCO 73-CL-1/2 is a standard boiler drain valve for draining and servicing hydronic heating systems. Its body and bonnet are constructed from durable cast copper-based alloy C84400. The valve features a Buna-N seat disc, an asbestos-free graphite packing, and a 1/2-inch female iron pipe (FIP) connection. This reliable valve is designed for long-term service in residential and commercial boiler applications.