Solvent Weld Waste 40Mm 90Deg Knuckle - White

Solvent Weld Waste 40Mm 90Deg Knuckle - White

The 40mm Solvent Weld 90 Knuckle Bend is a high-strength waste pipe fitting used to create sharp, right-angle turns in domestic and commercial drainage systems. The "Knuckle" design is specifically engineered to be more compact than a standard swept bend, making it the ideal solution for tight spaces behind kitchen units, under shower trays, or within bathroom vanity furniture.

This fitting is designed for Solvent Weld installation, where a chemical adhesive (solvent cement) creates a permanent, molecular bond between the pipe and the fitting. This results in a joint that is effectively "welded" together, making it completely leak-proof and more resistant to impact and temperature fluctuations than push-fit alternatives.

Key Features and Specifications

Size: 40mm (Standard UK size for kitchen sinks, dishwashers, and showers).

Angle: 90 (Right Angle).

Material: High-quality ABS (Acrylonitrile Butadiene Styrene) or PVC-mu.

Color: White (Typically used for internal waste runs to match bathroom fixtures).

Joint Type: Solvent Weld (Requires solvent cement).

Design: Compact "Knuckle" profile for space-saving installations.

Durability: Resistant to most household chemicals and high-temperature water discharge from washing machines and dishwashers.

Common Applications

Kitchen Sinks: Navigating waste pipework around sink bowls and plumbing kits within a base cabinet.

Shower Waste: Creating the initial 90 turn immediately after the shower trap where floor void depth is limited.

Appliance Drainage: Connecting washing machine or dishwasher standpipes to the main waste stack.

Bathroom Renovations: Concealing waste pipes within stud walls or narrow decorative boxing.

Installation Best Practices

Preparation: Ensure the pipe is cut square and all burrs are removed using a deburring tool or sandpaper.

Cleaning: Use a dedicated pipe cleaner to remove grease and debris from both the pipe end and the internal socket of the knuckle bend.

Welding: Apply an even layer of solvent cement to both surfaces, push them together firmly, and give a slight twist to ensure total coverage.

Set Time: Hold the joint for roughly 20-30 seconds to allow the initial bond to form; avoid putting the joint under pressure for at least 10-15 minutes.

Essential Companion Products

Adhesive: Solvent Cement (Available in tins with integrated brushes).

Cleaner: Pipe Cleaning Fluid.

Pipework: 40mm Solvent Weld Waste Pipe (Available in 3m or 4m lengths).

Clips: 40mm Pipe Clips for securing the waste run to walls or units.

Cutting: Plastic Pipe Cutter or a fine-toothed hacksaw.

Specialist Support and Local Collection

Solvent weld systems provide the most secure and permanent waste solution available. We stock a full range of 40mm solvent fittings including knuckles, swept bends, tees, and couplers in White, Grey, and Black.

Visit our trade counter at 61 Fullers Road, E18 2QB for immediate collection. Our team can help you select the right solvent cement for your specific pipe material (ABS or PVC).