The 10" Febco 850 Series began production in 1993 and was discontinued in 2014. The 850 was replaced by the LF850 which is the lead free version to meet new nation wide codes. Known as the "Master Series" the 850 is constructed of epoxy coated ductile iron with bronze check assemblies. Checks are a swing check type with self contained spring modules. Check seats are replaceable. Check discs are vulcanized rubber disc type. In 2010, the lead free version, 850LF was introduced. The "leaded" and "lead free" models use the same repair parts. No special tools are required for servicing.