This is a check cover assembly for the 4" Febco LF850, LF856, 856ST, LF860, LF866 backflow preventers. This cover will fit either the first or second check. No special tools are required for servicing. Genuine Febco repair parts.
**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.