Marathon BS-1300CI Cast Iron Retro Ring & Dome

The Marathon BS-1300CI Cast Iron Retrofit Ring & Dome provides a rugged solution for retrofitting existing roof drains. Built from heavy-duty cast iron, it delivers superior strength and long-term performance. This retrofit assembly is designed to fit 3-bolt or 4-bolt drain patterns ranging from 6-1/2″ to 11-3/4″, making it versatile for multiple roof drain installations.

Key Features:

• Cast iron retrofit dome with ring assembly
• Compatible with 3- or 4-bolt drain patterns
• Fits bolt patterns ranging from 6-1/2″ to 11-3/4″
• Heavy-duty construction for maximum durability
• Corrosion resistant finish for long service life

• Model / Part Number: BS-1300CI
• Product Type: Cast Iron Retrofit Ring & Dome
• Compatibility: 3-bolt and 4-bolt patterns
• Bolt Pattern Range: 6-1/2″ to 11-3/4″
• Material: Cast iron
• Finish: Black enamel (standard)

• Remove the existing dome and ring from the roof drain.
• Clean the drain bowl and ensure the bolt holes are free of debris.
• Align the retrofit ring with the existing bolt pattern (3-bolt or 4-bolt).
• Secure the ring in place using the appropriate bolts.
• Position the cast iron dome onto the retrofit ring.
• Verify the assembly is stable and properly aligned.
• Run water to confirm free drainage.

Q: What bolt patterns does the BS-1300CI fit?
A: It fits both 3-bolt and 4-bolt drain patterns ranging from 6-1/2″ to 11-3/4″.

Q: What material is the BS-1300CI made from?
A: It is constructed from heavy-duty cast iron.

Q: Why choose cast iron over aluminum?
A: Cast iron provides greater strength, durability, and resistance to heavy impacts.

Q: What type of roof drains is this product designed for?
A: It is made for retrofit roof drain applications.

Q: Is the finish corrosion resistant?
A: Yes, the BS-1300CI comes with a standard black enamel coating for added corrosion protection.