Waterworks › Double Check Detector Backflow Assemblies Image 1 of 1 Double Check Detector Backflow Assemblies $0.00 Connection Type: FL X FLSize: 2-1/2”, 3”, 4”, 6”, 8”, 10”, 12” Add To Cart Added! Connection Type: FL X FLSize: 2-1/2”, 3”, 4”, 6”, 8”, 10”, 12”