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The 4" Febco LF856 Series double check detector assemblies began production in 2014. The LF856 replaced the 856ST. Known as the "Master Series" the LF856 is constructed of epoxy coated ductile iron with stainless steel internal parts. Checks are a swing check type with self contained spring modules. Check seats are replaceable. Check discs are vulcanized rubber disc type. Parts do not interchange between LF856 and 856ST/856 models. Please be sure of your mdel before ordering parts. No special tools are required for servicing.