The Febco 858 is a double check detector assembly (DCDA). It was available in 2 1/2″-3″ sizes and was produced from 2006-2015. The body was made of epoxy coated ductile iron. The 858 utilized a 3/4″ Watts 007M3 for the bypass assembly. The 858 was a Febco private label of the Watts 007DCDA.