Roof Drain with 4.00″ Gravel Stop and Adjustable Extension

This 15-1/4“ (390) diam. drain is engineered for roofs with the Insulated Roof Membrane Assembly (IRMA). It adjusts to roof thickness on-site by spinning its combination flange clamp and gravel stop assembly around the drain’s threaded extension and accommodates roofs between 1-1/4″ and 4″ thick with up to 2-3/4″ of insulation. A 4″ perforated stainless steel gravel guard protects drain lines from crushed gravel usually installed with IRMA systems along with a polyethylene dome strainer. Drain body and flange assembly are made of Duco coated cast iron.