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This drain blanking cap from McAlpine is affordable and durable. Manufactured with a confident polypropylene structure, this drain blanking cap is perfectly suited for sealing cast iron, plastic or clay.Features & Benefits: McAlpine Drain Blanking Cap - 4 inch, Affordable, For sealing cast iron, plastic or clay, Durable, Polypropylene structure, 4 inch/110mm. McAlpine Drain Blanking Cap - 4 inch Black Polypropylene DC4-BL