The 2" Watts 719 Double Check Assembly began production in 2003 and is still currently in production. This is a two cover, bronze bodied device. Check covers unthread from the body. Checks are not self contained and covers have spring tension against them. Use caution when servicing. The check poppets are plastic and a replacable plastic seat threads into the body. In 2009, A lead free version was introduced, designated by a "LF" prefix. No special tools are required for servicing.