Diaphragm Assembly, Internal, No Spring, for AV1100 Spray Valve, UnitedBuilt AV1100 SK Groove by Weld The UnitedBuilt AV1100 SK Internal Diaphragm Elkhart Vulcan 8500 02 The UnitedBuilt AV1100 SK Internal Diaphragm Assembly is the genuine OEM replacement seal assembly for the UnitedBuilt AV1100 air to close water truck spray valve Rolled edges & ribbed discs provide strength & safety Application Use Case AV1100 Spray Valve Repair Rebuilds the internal diaphragm assembly of a UnitedBuilt AV1100 valve Water Truck Spray Systems Services AV1100 valves controlling water truck spray bars and spray nozzles Preventive Maintenance Replace worn internal sealing components while retaining serviceable valve components Water Truck Repair Parts Genuine UnitedBuilt replacement assembly for field and shop repairs allowing normal wear items to be replaced while retaining the valve body