Dome Features: Broad 12" diameter dome for maximum drainage area Low profile 5" overall height designed for stability, strength and handsome profile Multiple openings matched to the base ring "V" grooves to maximize drainage Twist-n-lock attachment, plus 2 bolts to secure to base ring. Vandal Resistant The Retrofit Ring & Dome will match up to most old style existing drains. Designed for re-roofing applications when a clamping ring is important to secure single-ply and two ply membranes in waterproof roof systems. By aligning Marathon's Retrofit Ring over the existing bolt holes in the old drain body and installing the new hold-down bolts with washers, the difficult problem of replacing matching domes is resolved. Ring and Dome may be purchased separately or in combination. Together they offer a positive fit with locked in and bolt-down features.
