The Ultimate Guide to Plumbing Fittings: MDPE, Polyplumb, Compression and More

When it comes to building a reliable, long-lasting plumbing system, choosing the right fittings is just as important as selecting the correct pipework. Whether you are installing a new heating system, upgrading domestic pipework or repairing an existing setup, the quality and compatibility of your fittings will determine overall performance. At Heating-Parts.co.uk, we stock a complete range of fittings including MDPE, Polyplumb, compression, push-fit, brass and copper options to support every type of installation.

This guide explains the differences between the most commonly used plumbing fittings and how to select the right components for your project.

Why Choosing the Right Fittings Matters

Plumbing fittings must withstand pressure, temperature changes and constant daily use. Poor-quality or incompatible fittings can cause leaks, system inefficiency or even water contamination. Selecting the correct fitting type ensures:

Reliable long-term performance
Leak-free connections
Compatibility with pipe materials
Fast installation time
Compliance with UK plumbing standards

Understanding each type of fitting helps you make informed choices, whether you are working with heating engineers, plumbers or completing your own repair.

Polyplumb Fittings: Flexible, WRAS-Approved Push Fit

Polyplumb fittings are among the most popular modern plumbing solutions thanks to their ease of installation and reliability. Manufactured by Polypipe, this system is suitable for both hot and cold water services as well as central heating.

Key advantages include:
Demountable push-fit design
Suitable for copper and PB pipe (with correct inserts)
Withstands high working temperatures
WRAS approved for potable water
Ideal for confined spaces and retrofits

Polyplumb is often chosen for customers who want flexibility and speed without compromising on long-term performance. Available in 15 mm, 22 mm and 28 mm, it is widely used in modern domestic installations.

MDPE Fittings & Pipe: The Best Choice for Underground Water Supply

MDPE (Medium Density Polyethylene) pipework is the standard for underground mains cold water. Its strength, chemical resistance and long service life make it the safest and most dependable option for incoming water supply.

Our MDPE range includes:
MDPE pipe coils (20 mm, 25 mm, 32 mm etc.)
Compression MDPE fittings (elbows, tees, couplers)
Adaptors and connectors
Rubber adaptors for transition joints

MDPE fittings use compression technology to form a strong, watertight seal. They are approved for potable mains water and designed to withstand ground movement and external pressure.

Compression Fittings: Durable and Ideal for High-Pressure Systems

Compression fittings are a long-standing and trusted solution for copper and plastic pipe. They create a secure mechanical seal using an olive and nut, making them easy to maintain and adjust.

Benefits include:
Suitable for copper and plastic pipe
No heat or soldering required
Ideal for high-pressure water systems
DZR brass options for improved corrosion resistance
Perfect for repairs and mixed-material systems

Compression fittings are highly versatile and remain a preferred choice for both heating engineers and plumbers working on hot water, cold water or sealed heating systems.

Copper End Feed & Solder Ring Fittings: For Permanent, Professional Joints

Copper remains one of the most reliable materials in plumbing, especially where heat resistance and system durability are required.

End feed and solder ring fittings are ideal for:
Central heating pipework
Boiler connections
High-temperature applications
Professional-grade installations

End feed fittings require soldering and flux, while solder ring fittings include a pre-installed solder ring for quicker installations.

Push Fit Pipe & Fittings: Speed and Convenience

Push-fit systems offer fast installation without tools. They are widely used in domestic plumbing upgrades, tight spaces and maintenance work.

Advantages include:
Tool-free installation
Reusable and adjustable
Compatible with copper and plastic
Reliable O-ring sealing

Brands like Polyplumb dominate this category due to their mechanical strength and WRAS approval.

Why Buy Your Plumbing Fittings From Heating-Parts.co.uk

We focus on supplying trade-quality plumbing components at competitive prices. Our customers benefit from:
Wide range of Polyplumb, MDPE, compression, push-fit and copper fittings
Fast delivery across the UK
Support from heating and plumbing specialists
Reliable stock levels for trade and domestic projects
Competitive pricing for bulk orders

Whether you are upgrading a full heating system or replacing a single fitting, we provide high-quality parts designed for long-term performance.

Choosing the right plumbing fittings is essential for creating a reliable, efficient and safe system. From Polyplumb push-fit to MDPE underground pipework and traditional compression fittings, each type offers unique benefits depending on the installation requirements. Heating-Parts.co.uk supplies everything needed for plumbers, heating engineers and homeowners looking for professional-grade materials delivered quickly and affordably.

Published on 21 November 2025