The Conbraco 40-100/40-100T is a double check valve assembly (DCA). It was available in 3/4″-2″ sizes and was produced from 1989-2012. Originally, the 40-100 did not come standard with replaceable check seats but was available as an option. In 1994 replaceable check seats became standard. The 40-100 was produced in a wye pattern (40-100) or top entry design (40-100T). In 2002, the wye pattern was discontinued. The body was made of bronze.