New style roof dome by MIFAB. Please see attached videos. It’s to prevent clogging around roof drain. This also allows water to flow through the drain. MIFAB can provide you with the quality, engineered plumbing and drainage solutions you need. Innovative product designs save the installer time and material cost and provides the owner with higher quality cast stainless steel drains and clean outs for the same cost as the industry standard nickel bronze. Contact us today to learn more!