110mm Underground 90° Long Radius Bend

The Kalsi Group 110mm Underground 90° Long Radius Bend is a terracotta PVC-U drainage fitting designed to create a full 90-degree directional change in below-ground pipework whilst maintaining maximum flow efficiency. Manufactured by Kalsi Group at their Birmingham plant, it is the go-to choice for groundworkers, drainage contractors, and DIY builders who need a reliable, standards-compliant fitting for domestic and commercial foul water and surface water systems.

Key Features and Specifications

• Pipe diameter: 110 mm (4 inch) — the UK standard size for domestic underground drainage
• Angle: 90° long radius (large-sweep) bend
• Material: PVC-U (unplasticised PVC) — moisture-resistant, chemically robust, and impact-resistant
• Colour: Terracotta — the recognised below-ground drainage colour, easily distinguished from above-ground soil pipework
• Joint type: Plain ended — compatible with ring-seal push-fit sockets and couplers across the Kalsi 110 mm system and most major brands
• Burial depth rating: Suitable for gravity drainage installations to 10 m depth (SN4)
• Certification: Kitemark certified to BS EN 1401-1; BBA approved; compliant with Building Regulations Approved Document H
• Application: Gravity drainage and sewerage systems — foul water and surface water
• Interchangeable with 110 mm fittings from other leading brands including Osma/Wavin, Polypipe, Marley, Hunter, Floplast, and Brett Martin

Applications

• Changing direction in underground foul drainage runs from WCs, soil stacks, and kitchen waste
• Surface water drainage for driveways, patios, and roof downpipe connections
• Base-of-stack connections where a slow, sweeping radius is required to prevent blockages
• New-build housing drainage layouts and groundwork drainage installations
• Repair and alteration of existing 110 mm underground drainage systems
• Commercial and civil drainage projects requiring BS EN 1401-1 compliant fittings

Why Choose This Product

The long radius design delivers a gentler, more gradual curve than a standard knuckle bend, significantly reducing turbulence and the risk of blockages — particularly important at high-flow junctions and base-of-stack positions. Kalsi Group’s PVC-U formulation provides excellent chemical resistance and long-term durability underground. Kitemark and BBA certification give contractors and building control officers confidence that the fitting meets UK regulatory requirements. The plain-ended format speeds up installation with compatible ring-seal couplers, and the terracotta finish integrates seamlessly with all standard underground drainage systems.

Delivery in and Around London

We deliver the Kalsi Group 110mm Underground 90° Long Radius Bend to London boroughs including Croydon, Lewisham, Southwark, Camden, and Hackney, as well as Greater London areas such as Enfield, Bexley, Redbridge, and Barnet. We also supply to the surrounding counties of Kent, Essex, Surrey, and Hertfordshire. Trade quantities are welcome — contact us for bulk pricing and scheduled deliveries to site.