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®
DURO-LAST COMPOSITE DRAIN RINGS

DESCRIPTION:
®
Duro-Last Composite Drain Rings, or “CDRs”, are
manufactured from a state of the art epoxy-
fiberglass composite. The rings are shipped tied
together with a cord approximately 12 inches (305
mm) long. Their purpose is to provide compression
in order to create a positive seal between the drain
boot and the drain pipe.

INSTALLATION:
1. Insert the first drain ring as low into the installed
drain boot as possible, 6 inches (152 mm)
minimum depth. Cut the compression ring cord to
expand the ring.
2. Install the second ring in a like manner with the
opening located opposite the opening of the first
ring. Cut the compression ring cord to expand the
ring.

3. Sealant and CDRs must be installed at the same
depth within the drain.
4. Refer to detail 2020 for installation information.

Composite Drain Rings
(Install per detail drawing 2020)

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Duro-Last and “World’s Best Roof” are registered trademarks owned by Duro-Last, Inc.
Created: 01/01/2009 Revised: 12/31/2015