Brett Martin 450mm to 350mm Twinwall Riser Restriction Ring for use with 45TP15 & 45TP3

The product is a restriction / reducer ring (sometimes called a “chamber reducer” or “inspection chamber reducer”) — used in underground drainage and inspection-chamber systems. It reduces the internal diameter from 450 mm down to 350 mm. It’s designed for use with 450 mm inspection chambers (or chamber assemblies) — when you need a smaller 350 mm access opening.

⚙️ Key Specifications & Standards

• Outer Diameter (OD): 450 mm.

• Reduced Opening / Internal Diameter: 350 mm.

• Material: Plastic / Polypropylene (or similar durable plastic used for underground drainage fittings).

• Compatibility: Intended for use with 450 mm chamber assemblies from the manufacturer.

• Standards / Certification: Manufactured under a quality management system certified to ISO 9001. Also tested to relevant drainage / underground drainage standards.

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