The Febco LF856 is a double check detector assembly (DCDA). It is available in 2 1/2″-10″ sized and began production in 2014. The body is made of epoxy coated ductile iron. The LF856 utilizes a 3/4″ Watts LF619 single check type II bypass. The LF856 mainline body is visually identical to the 856 and 856ST but the parts do not interchange.