450mm Man Hole Chamber Base450mm Black UPVC Manhole Chamber Base Robust Foundation for Larger Underground Drainage Systems Create a solid and reliable inspection chamber with this high quality 450mm Manhole Chamber Base. Constructed from durable UPVC (unplasticized polyvinyl chloride), this black chamber base serves as the perfect foundation for deeper or higher flow underground soil waste and drainage systems. It features multiple inlets for connecting 110mm pipes, ensuring
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