Watts 774DCDA DOSY CFM 12 Part of the 774DCDA Series detectable warning mat finder The blue hole saws are The blue hole saws are extra deep and are geared for all plastic pipes Strap with Flat Head Bolt Holes: Built in strap includes cast ¼ inch diameter holes to secure the boot firmly to the structure and resist movement This 12 inch double check detector backflow preventer assembly is designed to prevent the reverse flow of fire protection substances and water of non potable quality from being pumped or siphoned into the potable water supply due to backsiphonage and or backpressure in accordance with national plumbing codes and water authority requirements Cubic feet per minute meter