UK Plumbing Fittings Guide: Overview for Homeowners & Professionals

UK Plumbing Fittings Guide

John Guest Speedfit (Push-Fit Plumbing Fittings)

A push-fit system that locks pipes in place using internal grab-rings and o-rings. Ideal for rapid DIY installations and professional repairs without solder or special tools.

Key benefits:

• Tool-free connection and demounting
• WRAS-approved for drinking water
• Perfect for tight spaces and temporary fixes

Soldering & Yorkshire Fittings

Traditional copper joints fused by heat. Yorkshire fittings contain a factory-applied solder ring, while standard fittings require manual flux and solder.

Key benefits:

• Durable, tamper-proof joints
• Compact, clean finish
• Ideal for high-pressure or concealed pipework

Compression (Conex) Fittings

Mechanical seal formed by compressing a brass or copper olive onto the pipe. Common at taps, valves, and service connections.

Key benefits:

• No fire or torch required
• Compatible with copper, plastic (with insert), and chrome pipe
• Quick disassembly for maintenance

Press-Fit Plumbing Systems

Metal fittings crimped onto pipe ends using powered press tools. Favoured in commercial and flame-sensitive environments.

Key benefits:

• Secure, leak-resistant joints
• No solder, flux, or open flame
• WRAS-approved metal systems available

Solvent Weld / ABS Waste Fittings

Plastic waste and soil fittings bonded with solvent cement that chemically fuses surfaces into a permanent seal.

Key benefits:

• Strong, watertight drainage connections
• Lightweight, cost-effective materials
• Smooth bore minimizes blockages

Overflow & Condensate Pipe Fittings

Small-diameter (21.5 mm or 22 mm) plastic pipework for boiler condensate discharge and cold-water tank overflows.

Key benefits:

• Simple push-fit or solvent connections
• UV-resistant options for external runs
• Essential for safe boiler and tank operation

Alkathene / MDPE Water Supply Fittings

Medium-density polyethylene used underground for drinking-water mains. Fittings include push-fit and compression adaptors.

Key benefits:

• Highly durable and freeze-resistant
• WRAS-approved for potable water
• Wide range of sizes and adaptors

Conclusion & Next Steps

Choosing the right fitting depends on project scope—speed of install, permanence, material compatibility, and access requirements. From push-fit systems for quick DIY jobs to solvent-weld drainage and robust underground MDPE solutions, each fitting type solves a specific challenge.

💡 Pro Tip: Always verify WRAS approval, pressure ratings, and operating temperature before installation.