Product Description Round Conduit 20mm 2m Black. Robust, heavy duty 20mm inspection elbow provides a tidy, safe and professional way to complete and protect electrical wiring installations. Made from high impact, rigid uPVC. Leading cable management solution for many basic installations. uPVC cable management systems allow for the segregation of power, low voltage, communication and computer cabling. Wide range of dedicated fittings and boxes for fast, high quality installation. Accepts standard wiring accessories which gives maximum flexibility when changes or extensions are required to the system.