Watts B2 DM 12-1/4 in Plastic Roof Drain Dome

Product Identity

The Watts B2 DM is a plastic roof drain dome designed for commercial and residential roofing systems. Its fluorescent orange colour provides high visibility during installation and maintenance checks. The component fits standard roof drain bodies that accept a clamp-on dome.

Installation Notes

The dome secures by clamping onto a compatible drain body, requiring only basic hand tools. Proper alignment of the clamp ensures a stable fit without fasteners. Installers should verify the drain body diameter matches the dome before work begins, as mismatched sizes are the most common cause of loose or uneven seating.

Capacity and Limits

The 12 1/4 inch overall diameter and seven inch height cover typical roof drain openings and provide adequate free area for water entry. The slotted grate surface passes water while blocking large debris. The plastic construction resists corrosion but is not rated for heavy structural loads or pedestrian traffic.