905481 (Febco) | 8 - 10 Inch | 850 Series DC | Dcda First or Second Check Repair Kit or 860/880 Second Check Repair Kit RP | RpdaThis Check Kit Includes The Parts Necessary to Repair or Replace Either The First or Second Check Module of an 8 And 10 Inch In Line Double Check Assembly, The First or Second Check of an 8 Inch N or Z Pattern Double Check Assembly, The First Check of an 8 or 10 Inch In Line Double Check Detector Assembly, The Second Check of an 8 or 10 Inch In Line Reduced Pressure Zone Assembly, The First Check of an 8 in N or Z Pattern Double Check Detector