The Grooved or Threaded Pattern Fire Department Connection is UL Listed and FM Approved. It is manufactured from brass* components to increase it’s service life. The single clapper design features a brass clapper and brass seats within a cast brass body. The 2½” inlets are pin lug design for ease of use and compatibility with local fire service districts. Swivel gaskets are included. Breakable caps or plugs should be installed to protect the threads and prevent debris from being accidentally introduced into the water way.