905061 (Febco) | 4 Inch | 805/806/825/826 DC | RP First or Second Check Rubber KitThis Rubber Parts Kit Includes All The Parts Necessary to Repair or Replace All Rubber Parts For Check of a 4 Inch Double Check Valve Assembly, Reduced Pressure Zone Assembly or Reduced Pressure Detector Assembly. Kit Includes Check Disc, Disc Holder O Ring, And Cover O Ring. All Parts Are Genuine And Original to The Valve. Febco 905061