Brett Martin Single Socket Level Invert Reducer (315mm x 250mm)

This is a single-socket level invert reducer produced by Brett Martin, designed to connect underground drainage/sewer pipes of different diameters — specifically reducing from a 315 mm pipe down to a 250 mm pipe. The “level invert” / “invert reducer” design means it provides a smooth transition between pipe sizes while maintaining the invert (internal floor) level of the drainage run.

Key Specifications & Certification

• Material: PVC-U (unplasticized PVC) — common for underground drainage due to durability, chemical resistance, and light weight. 

• Certifications / Standard Compliance: Certified to BS EN 1401-1 (and wider EN 1401 series where applicable) — meaning it meets recognised European standards for sewer and drainage pipework.

• Diameter Change: From 315 mm down to 250 mm.

• Part of a comprehensive drainage range: The reducer belongs to Brett Martin’s underground drainage / sewer systems line covering 200 mm, 250 mm, 315 mm and 400 mm diameters, with a full set of compatible fittings (pipes, couplers, bends, adaptors, plugs, etc.) 

 Purpose & Use — Why / When You’d Use It

• Use when you need to reduce pipe diameter — for example, when connecting a larger diameter main drainage run (315 mm) into a section of 250 mm pipe. Such transitions are often needed when linking to smaller downstream mains or adapting to different sections of a drainage network.

• The reducer ensures correct alignment and flow continuity, making sure the internal invert (bottom of pipe) remains level — this helps maintain proper flow rates and prevents pooling or backflow.

• Being part of an “adoptable sewer” / underground drainage system — it’s suitable for both residential and commercial drainage / wastewater applications (manholes, sewer mains, storm drainage, etc.).

• The single-socket design simplifies installation — using the socket end to receive the 250 mm pipe, and the plain/appropriate end for the 315 mm side, ensuring a secure, leak-resistant connection. 

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