Poly Dome: Outside diameter 12-1/2"Cast Iron Dome: Outside diameter 12-1/2"Clamping Ring: Outside diameter 13-3/4"Deck Plate: No underdeck clamp required Serves purpose of roof sump receiver Can be pre-assembled to drain body, great for pre-fab applications It’s Fast – Contractor can install roof drain in half the time as conventional methods … a superior method of installation using a bolt down system that secures roof drain assembly integrally to roof deck. It’s Secure –...