"Chamber riser with 185mm invert and designed for use with 315mm access chamber bases. 16+ connection possibilities. Watertight push-fit assembly. Easy to install. Lightweight. Durable."
"Base (225mm invert) for a 450mm access and inspection chamber assembly, designed with five 110mm inlet / outlet connections and supplied with three socket plugs. Quick & easy to install. Robust & Lightweight. Easy to joint. Durable. Made in the UK."