Marathon Roofing Products - Fast Pak Cast Iron Roof Drain

The Marathon Fast Pak Cast Iron Roof Drain (BS-1110FP for 3″, BS-1120FP for 4″) is a direct-connect roof drain made of cast iron, designed for easy installation directly from the roof deck without needing an under-deck clamp. It features a galvanized 18″×18″ extension/bearing flange, a molded polyethylene strainer bolted to a 10″ epoxy-coated aluminum clamping ring, and a flexible rubber expansion coupling. Ideal for use with steel, wood, concrete, or gypsum roof decks under single-ply or built-up roofing systems.

Key Features:

• Cast iron body designed for durability and corrosion resistance
  
• Molded polyethylene strainer bolts directly to clamping ring
  
• Metal clamping ring with gravel stop control
  
• Galvanized 18″×18″ extension/bearing flange for rooftop installation
  
• UV stabilized components for long life
  
• Flexible rubber expansion coupling included

• Sizes / Part Numbers: 3″ outlet – BS-1110FP; 4″ outlet – BS-1120FP
• Body material: Cast Iron
• Flange dimensions: 18″ × 18″ galvanized extension/bearing flange
• Outlet type: No hub outlet
• Clamping ring: 10″ epoxy-coated aluminum clamping ring
• Strainer: 10″ molded polyethylene strainer (standard)
• Packaging: 1 per carton

• Select the correct size model (3″ or 4″) to match your outlet pipe.
• Prepare the roof deck by cleaning around the planned installation area and ensuring the membrane is in place.
• Position the drain so the galvanized flange rests flat on the roof surface.
• Bolt the molded polyethylene strainer to the epoxy-coated 10″ clamping ring.
• Attach the flexible rubber expansion coupling to connect to the existing drain pipe or downstream piping.

Q: What is the material of the drain body?
A: The body is cast iron.

Q: What are the flange dimensions?
A: The flange is 18″×18″ galvanized extension/bearing flange.

Q: What is the standard strainer material?
A: It is a molded polyethylene strainer, 10″ in diameter.

Q: Is a coupling included?
A: Yes, a flexible rubber expansion coupling is included.

Q: What are the available sizes?
A: Two outlet sizes: 3″ (BS-1110FP) and 4″ (BS-1120FP).