Zurn RD2190 Universal Membrane Clamp Only

The Zurn RD2190 is a universal retrofit membrane clamp designed to reuse existing roof drain bodies. It features a Dura-coated cast iron collar with integral gravel guard and tie-down lugs that match common bolt patterns for 10″ to 15″ drain bodies. It ships complete with mounting hardware and Toughnutz bolts.

Key Features

• Dura-coated cast iron collar with integral gravel guard
• Universal fitting for retrofit to 10″ to 15″ roof drain bodies
• Tie-down lugs match common bolt patterns
• Includes mounting hardware and Toughnutz bolts
• Suitable for roof drain retrofit without replacing the drain body

• Product / SKU: RD2190
• Material: Cast iron, Dura-coated
• Collar outside diameter: 13-5/8″ (13.625 in) for membrane clamp version 
• Height (overall): 1 in (for clamp version) 
• Fits bolt center radii: matches bolt patterns for 10″ to 15″ drain bodies 
• Hardware included: assorted hex head bolts, studs, nuts, washers and mounting hardware 
• Weight (shipping): ~9.3 lb 
• Application type: Retrofit membrane clamp for roof drains

• Position the existing roof drain body and clean the flange surface.
• Align the RD2190 clamp collar tie-down lugs with the bolt holes on the existing drain body.
• Secure the clamp using the included mounting hardware, ensuring the gravel guard is in place.
• Tighten the bolts to compress the membrane and form a seal.
• Inspect for proper sealing and alignment before installing the dome or finishing roofing.

Q: What types of roof drains can RD2190 clamp to?
A: It is designed to retrofit onto common roof drain bodies 10″ to 15″ in diameter.

Q: What material is the RD2190 clamp made from?
A: The clamp is cast iron with a Dura-coated finish.

Q: What is the collar outside diameter of RD2190?
A: The collar’s outside diameter is 13-5/8″ (13.625 in) in the membrane clamp version.

Q: Does RD2190 include hardware?
A: Yes, it includes mounting hardware: bolts, studs, nuts, and washers.

Q: What is the installed height of the RD2190 clamp?
A: The clamp version has an overall height of about 1 inch.