The termination or fitting at the roof of an interior drain or leader for draining rainwater from nominally flat roofs. The fitting itself usually consists of a base with or without a sump, a clamp ring and gravel stop, and a basket strainer to prevent debris clogging the drain. The base is sometimes fastened to the leader with an expansion-sleeved fitting. Some roofers dispense with the specially engineered roof drains, and use instead a flanged copper pipe stripped into the roofing felts with the end projecting loosely inside the leader.

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