A McAlpine DC2‑BL Drain Reducer Connector (4″/110 mm Drain Connector Soil to Waste Reducer 1 ¼″ – 1 ½″) is a plumbing fitting used to connect a large 110 mm (4″) drainage/soil pipe to smaller domestic waste pipes (1¼″ or 1½″). It has a finned spigot and sealing ring that provides a watertight joint between the larger drain and the smaller waste outlet, making it ideal for low‑level soil‑to‑waste connections in drainage systems.
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