A metal ring placed around the drainpipe to secure the roof drain to a surface, such as a roof deck or parapet wall. It is also called a clamp collar, clamp ring, drain ring or flashing ring.

Commercial cast-iron roof drains are often subjected to heavy weathering and regular wear and tear. As a result, their parts—including domes, rings, sump pans, and clamps—sometimes break, crack or rust over time, and need to be replaced.

Clamp Ring Sizes of Roof Drain:

There are 5 ways to take the measurement of the cast iron drain ring sizes:

(1) 4-Bolt Ring: Measure the bolt slots directly across the ring at 180 degrees.

(2) 3- or 5-Bolt Ring: Measure the distance between neighboring bolt slots, as they go around the inside of the drain ring.

(3) Inner Diameter (I.D.): Measure the distance between the ring's inside edge of the gravel stop, directly across at 180 degrees.

(4) Outer Diameter (O.D.): Measure the distance between the ring's outside edges at 180 degrees. Include any lip or flange that extends beyond the gravel stop.

(5) Lug Style: Lug style drains are measured the same as bolt-style drains, except the measurement is taken from the center of the pad's dimple.

Cast iron clamp drain ring

This article is from our Dandong Foundry's Cast Iron Clamp Ring for Roof Drain

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