This is a single check disc assembly for the 4" Febco 860 Series reduced pressure zone backflow preventers. This disc assembly will fit either the first or second check kit. This is a vulcanized clapper disc style rubber and is a direct replacement. Genuine Febco repair kit. No special tools are required for servicing.
**Notice: The original Febco 860 and LF860 use different parts. Please be sure which model you have before ordering. The LF860 can be identified by an epoxy coated relief valve body. The original 860 had a bronze relief valve body.