Flexible Adaptor Coupling 4″ Clay to 4″ Plastic

The Flexible Adaptor Coupling 4″ Clay to 4″ Plastic by Kalsi Group is a purpose-engineered rubber drainage coupling designed to create a secure, watertight joint between 4-inch (100mm) vitrified clay pipe and 110mm PVC-U plastic underground drainage pipe. Part of the trusted Kalsi Aquaflow underground drainage system, it is the go-to solution for groundworkers, drainage contractors, and DIY builders connecting new plastic drainage to existing clay pipework on UK residential and commercial sites.

Key Features and Specifications

• Connection: 4″ (100mm) vitrified clay pipe one end; 4″ / 110mm PVC-U plastic pipe the other end
• Sleeve material: Flexible EPDM rubber — resistant to chemicals, sewer gases, and ground movement
• Clamp bands: Stainless steel worm-drive jubilee clips for a firm, corrosion-resistant seal
• Application type: Non-pressure underground drainage and sewerage systems
• Manufactured by: Kalsi Group (Kalsi Plastics), Birmingham, UK
• Quality system: Manufactured under ISO 9001 quality management
• Installation: Tool-free fitting — slide over pipe ends and tighten clamps with a flat-head screwdriver
• Suitable for: Below-ground and above-ground drainage applications

Applications

• Connecting new 110mm PVC-U drainage to existing 4″ clay sewer pipes — the most common groundwork task on UK extension and renovation projects
• Repairing or replacing damaged sections of clay drain without disturbing the full run
• Joining clay pipework to inspection chambers, manholes, and septic tanks fitted with plastic inlets
• Domestic and light-commercial drainage upgrades, loft conversions, rear extensions, and new bathroom connections
• Making additional branch connections into existing clay drainage systems

Why Choose This Product

The Kalsi Group Flexible Adaptor Coupling 4″ Clay to 4″ Plastic is a field-proven fitting from a UK manufacturer with decades of drainage expertise. The EPDM rubber sleeve accommodates slight dimensional variations between clay and plastic pipe outside diameters, ensuring a leak-free seal even where pipes are not perfectly aligned. Stainless steel clamp bands resist corrosion underground, and the simple push-and-tighten installation saves time on site. Suitable for trade quantities, it offers reliable compliance with UK drainage practice and Building Regulations requirements for new drain connections.

Delivery in and Around London

We deliver the Flexible Adaptor Coupling 4″ Clay to Plastic across London and the surrounding region, including inner boroughs such as Croydon, Lewisham, Southwark, Camden, and Hackney, as well as Greater London areas including Enfield, Bexley, Redbridge, and Barnet. We also supply to the surrounding counties of Kent, Essex, Surrey, and Hertfordshire. Trade quantities are welcome, and same-day or next-working-day despatch is available on stocked items — contact us to confirm availability and arrange delivery to your site.