The 320mm Underground uPVC Mini Inspection Chamber Base 3-Inlet is a robust and compact foundation component engineered for efficient junction management in below-ground gravity drainage and sewerage networks. Manufactured from high-impact, durable unplasticized polyvinyl chloride, this chamber base is designed to endure heavy external soil loads, ground movement, and corrosive subterranean environments, ensuring long-term structural reliability beneath residential or light commercial properties.
 
Featuring three pre-formed inlets, this compact base provides excellent layout flexibility, allowing multiple incoming drainage pipes to converge into a single central outflow channel. The integrated flow channels are carefully molded with smooth internal sweeps to promote optimal hydraulic performance, preventing turbulence and minimizing the risk of blockages or sediment buildup. Each inlet and outlet is designed for secure compatibility with standard 110mm drainage systems, ensuring a tight and reliable connection.
 
Tailored for 320mm diameter systems, the base is fully compatible with matching mini inspection chamber risers and covers, allowing installers to easily adjust the depth to meet finished ground levels. By providing a designated access point for maintenance, rodding, and CCTV inspection, this 3-inlet chamber base simplifies upkeep and delivers a professional-grade, watertight solution for modern subterranean drainage layouts.
 
Base for use with 320mm Universal Inspection Chamber shaft 
110mm straight channel with two 110mm (2 x 45 angle) left/right hand branch entries for use with 110mm components
Supplied complete with profiled, blank-off plugs for use in unused side entries
Universal IC can be use to a max 1.2m invert depth (adoptable and non-adoptable)