The 3" Watts LF007 double check assembly began production in 1989 and is still currently being produced. The LF007 is an inline check design with a single access cover. The body is epoxy coated cast iron construction. Fully testable. Many valve options are available, flanged ball valves and flanged gate valves. The "LF" prefix stands for "Lead Free" to meet the low lead laws of 2015.