This is a first check spring module for the 8 - 10" Febco 860 (8" 880) Series reduced pressure zone backflow preventers. This spring module is a self contained assembly. Replace your weak or broken spring with this genuine Febco repair kit. No special tools are required for servicing.
**Notice: The original Febco 860 & 880 and LF860 & LF880 use different parts. Please be sure which model you have before ordering. The LF860 & LF880 can be identified by an epoxy coated relief valve body. The original 860 & 880 series had a bronze relief valve body