The Complete Guide to JG Speedfit Push-Fit Plumbing: Everything Installers Need to Know

Push-fit plumbing has become one of the most reliable and efficient installation methods in modern plumbing and heating systems. Among all manufacturers, JG Speedfit remains the industry leader for domestic and light commercial push-fit fittings. Known for its secure connections, WRAS-approved components and rapid installation, Speedfit is now widely used across hot and cold water systems, central heating pipework, underfloor heating and potable water applications.

This guide provides a detailed overview of how JG Speedfit works, the core product range and why installers continue to choose it over traditional copper and compression fittings.

What Is JG Speedfit Push-Fit Plumbing?
JG Speedfit is a push-fit plumbing system that allows installers to join pipes and fittings without the need for tools, heat, soldering or adhesive. Connections are made by simply pushing the pipe into the fitting until it locks securely into place. The internal stainless-steel teeth grip the pipe, while an EPDM O-ring provides the watertight seal.

Speedfit is compatible with:
• Copper pipe
• Plastic barrier pipe
• PB and PEX pipe (depending on application)
• MDPE (with correct adaptors)

The system is fully demountable, allowing fittings to be repositioned, reused or removed during installation and maintenance.

How JG Speedfit Push-Fit Technology Works
Each Speedfit fitting uses three key components to create a reliable and long-lasting joint:

1. Stainless-Steel Grip Ring
Provides a strong mechanical hold on the pipe without damaging its surface.

2. EPDM O-Ring Seal
Creates a watertight seal suitable for hot and cold water systems, sealed heating circuits and potable water.

3. Release Collet
Allows full demountability by pushing the collet back to release the pipe.
This design ensures Speedfit connections withstand system pressure, temperature fluctuations and vibration.

Benefits of Using JG Speedfit in Plumbing and Heating Systems

Fast Installation
Push-fit fittings reduce installation time significantly compared with soldering or using compression joints. No heating equipment, consumables or drying time is required.

Consistent, Secure Joints
The internal locking and sealing components ensure each joint is consistently secure. This reduces the risk of installer error.

No Heat or Flux Required

Speedfit installations are ideal for confined spaces, commercial sites, and settings where naked flames are not permitted.

Demountable for Maintenance
If the system design changes or maintenance is required, fittings can be easily removed and reused.

Corrosion and Scale Resistance
Speedfit components are made from durable polymer materials that do not corrode, resist scale build-up and maintain long-term stability.

WRAS Approved
Most Speedfit fittings and components meet UK water regulations for potable and domestic systems.

Where JG Speedfit Is Used
Speedfit components are designed for a wide range of applications, including:

• Domestic hot and cold water plumbing
• Central heating pipework
• Sealed heating systems
• Underfloor heating manifolds and circuits
• Appliance connections
• Cylinder connections
• MDPE to copper transitions
• Bathroom and kitchen installations
• Microbore heating systems
• System alterations and upgrades

Because the system works with both copper and plastic pipe, it is widely used in new builds, refurbishments and emergency repairs.

Core JG Speedfit Push-Fit Products

Below are the primary product types installers rely on:

Equal Fittings (Couplers, Elbows, Tees)
Used to join pipe of the same diameter.
Available in 10mm, 15mm, 22mm, 28mm and larger sizes.

Reducing Fittings
Designed to adapt pipe diameters (e.g., 22mm to 15mm, 15mm to 10mm).

Tap Connectors and Cylinder Connectors
Enable secure threaded connections to taps, appliances and cylinders.

Service Valves and Isolation Valves
Allow quick shut-off for easy maintenance.

Flexi Tap Connectors
Provide vibration resistance and flexibility for appliances and taps.

MDPE x Copper Adaptors
Allow safe transitions from underground mains pipe to internal plumbing.

Manifolds
Used for underfloor heating or multi-zone plumbing systems.

Stop Ends
Provide a reliable termination point for temporary or permanent sealing.

Each fitting is engineered for durability, pressure performance and long-term stability.

Why Installers Choose JG Speedfit Over Traditional Copper and Compression Fittings

Speed and Efficiency
Installations are completed faster, reducing overall labour and project time.

No Specialist Skills Required
Even in challenging environments, push-fit is safer and easier to install.

Reliability
The combination of mechanical grip and O-ring sealing provides a consistent, trusted connection.

Versatility
Suitable for hot water, cold water, heating and potable systems.

Cost-Effective
Reduced installation time and fewer consumables mean lower total project costs.

Tips for Getting the Best Performance from JG Speedfit

• Always use the correct pipe inserts for plastic pipe.
• Cut pipe squarely and deburr to prevent damage to O-rings.
• Ensure pipe is fully inserted to the correct depth.
• Avoid overtightening threaded parts—hand-tight plus a quarter turn is usually sufficient.
• Only use Speedfit with approved pipe types and temperatures.
• For sealed heating systems, confirm O-ring compatibility with inhibitor chemicals.
• Use Superseal inserts for enhanced sealing security.

Following these guidelines ensures maximum reliability and longevity for the installation.

JG Speedfit continues to lead the market in fast, secure and reliable push-fit plumbing solutions. From domestic hot water pipework to complex multi-zone heating systems, Speedfit fittings allow installers to complete work quickly, safely and with long-lasting results. Its wide compatibility, WRAS approvals, ease of installation and robust performance make it an essential component of modern plumbing and heating systems.

Heating-Parts.co.uk supplies a full range of genuine JG Speedfit fittings, including couplers, elbows, tees, tap connectors, MDPE adaptors, flexi hoses and valves, ensuring every installation meets the highest standards of quality and reliability.

Published on 01 December 2025