The Polypipe ICDB1 150mm S/drain Inspection Chamber Base Unit 4riser is a high-quality, resilient underground drainage solution. Its designed to provide a convenient inspection point for drainage systems and is manufactured from durable polypropylene for longevity. This unit features four riser openings and is compatible with 150mm Polypipe systems, ensuring seamless integration into existing setups. The ICDB1 model meets all relevant British standards, making it a reliable choice for both domestic and commercial use.