Blog posts of '2025' 'July'

Introduction to MLCP Press Fittings

Multi-Layer Composite Pipe (MLCP) press fittings are widely used in both residential and commercial plumbing systems due to their ease of installation, durability, and corrosion resistance. They're designed to create strong, watertight seals using mechanical pressing tools. Despite their reliability, users sometimes encounter issues—many of which stem from incorrect handling or improper installation techniques.

This guide offers expert insight into recognising, fixing, and preventing common problems associated with MLCP press fittings.

Why MLCP Press Fittings Are Popular in Modern Plumbing

MLCP press fittings merge the flexibility of plastic with the strength of aluminium. This hybrid construction offers numerous benefits:

• Reduced thermal expansion: Makes them ideal for hot water installations.

• Ease of bending: Eliminates the need for multiple joints.

• Smooth internal bore: Helps maintain water pressure and hygiene.

Yet, no system is flawless. Understanding how they work helps in diagnosing and resolving typical faults.

Common Installation Mistakes

Incorrect installation is the most common cause of failure in MLCP press fittings. Below are the frequent errors made and their consequences.

Misalignment of Pipe and Fitting

Improper alignment during pressing can result in a partial seal or pipe deformation. This often leads to:

• Leaks under pressure

• Increased strain on fittings

• Potential damage to adjacent piping

To fix this, re-cut the pipe straight, ensure full insertion, and use the correct pressing tool.

Incomplete Pressing or Weak Joints

A joint that isn’t fully pressed can cause catastrophic failure. Always ensure:

• Pressing tool is calibrated

• Full press cycle is completed

• Jaws are in proper condition

Replace any fittings with visible deformation or incomplete crimps.

Failure to Deburr the Pipe

Deburring smooths the cut pipe edge, allowing secure seating within the fitting. Skipping this step can:

• Damage O-rings

• Cause improper seating

• Lead to internal turbulence

Use a manual or rotary deburring tool before inserting the pipe.

Recognising Signs of Faulty MLCP Fittings

Symptoms of issues may not always be immediate. Look for:

• Damp patches on walls or ceilings

• Reduced water pressure

• Unusual sounds when water flows

• Fittings with visible corrosion or damage

Early detection reduces the risk of structural damage and water waste.

Leak Detection Techniques

Use the following methods to identify problematic fittings:

• Visual inspection under pressure

• Infrared thermography for concealed leaks

• Moisture meters in surrounding structures

• Dye testing for pinpoint accuracy

Professional tools can significantly reduce troubleshooting time.

Tools Required for Repair and Maintenance

Before attempting any repair, ensure you have:

Quality tools are essential to ensure safe, lasting fixes.

Step-by-Step: How to Fix a Leaking Press Fitting

Isolating the Leak Source

1. Shut off the water supply.

2. Drain the system to relieve pressure.

3. Identify the faulty fitting visually or using leak detection tools.

Cutting and Repressing the Connection

1. Cut out the defective section using a pipe cutter.

2. Deburr the new pipe ends.

3. Mark insertion depth.

4. Insert pipe into a new fitting.

5. Use the press tool to secure the connection.

6. Restore the water supply and check for leaks.

This process ensures a permanent, reliable repair.

Preventative Measures to Avoid Future Issues

• Always use manufacturer-approved tools and parts.

• Follow the correct insertion depth.

• Regularly service pressing equipment.

• Train installers thoroughly on fitting procedures.

• Record installation parameters for future reference.

Prevention is more cost-effective than repairs.

When to Replace Rather Than Repair

Some fittings cannot be salvaged:

• Cracked pipes or fittings

• Extensive corrosion

• Repeated leakage at the same joint

• Incompatibility with surrounding materials

In such cases, it’s better to replace the entire segment.

Safety Considerations and Legal Compliance

Always adhere to local building regulations. This includes:

• Using approved materials

• Ensuring fittings are certified

• Documenting all work for inspection

• Wearing protective equipment during repairs

Failure to comply may result in penalties or insurance issues.

Professional Tips from Licensed Plumbers

Plumbers recommend:

• Press fittings over soldered joints for time efficiency

• Using depth gauges for precision

• Avoiding re-use of any press fittings

• Double-checking pipe compatibility before pressing

These small steps greatly increase success rates.

Comparing MLCP Press Fittings with Other Plumbing Systems

MLCP fittings provide a balanced option with excellent long-term reliability.

Maintenance Checklist for Long-Term Durability

Use this list during routine inspections:

• Inspect all visible joints for signs of wear

• Test water pressure monthly

• Clean and service press tools annually

• Replace fittings showing stress or movement

• Keep installation records up to date

Preventative maintenance extends system lifespan.

Frequently Asked Questions

1. Can MLCP press fittings be reused?

No. Once pressed, they form a permanent seal and should not be reused.

2. How long do MLCP press fittings last?

They can last over 50 years if properly installed and maintained.

3. What causes leaks in MLCP systems?

Usually due to poor installation: incomplete pressing, improper alignment, or skipping deburring.

4. Are MLCP fittings safe for drinking water?

Yes, provided they meet local certification and standards.

5. Can I install MLCP press fittings myself?

You can, but professional installation is recommended to avoid costly errors.

6. How do I know if the joint is fully pressed?

A visual inspection should reveal a uniform, complete press with no deformation or gaps.

Conclusion

Fixing common issues with MLCP press fittings doesn’t have to be daunting. With the right knowledge, tools, and techniques, you can tackle most problems quickly and effectively. Whether you’re a DIY enthusiast or a seasoned plumber, applying these best practices ensures your plumbing system remains reliable for years to come.

Shop MLCP Press Fittings as PressIT

PressIT Heating/Water 90degrees Bend 16x16

Introduction to Rothenberger Press Tools

Rothenberger press tools are among the most trusted solutions in the professional plumbing and HVAC world. Built with German engineering precision, they’ve revolutionised how pipe fittings are joined — eliminating the need for soldering, welding, or threading. But for beginners, understanding their operation can feel a bit overwhelming.

This guide walks you through how Rothenberger press tools work, why they're better than traditional joining methods, and how to use them confidently. Whether you're a DIY enthusiast or a budding tradesperson, this guide will give you the foundational knowledge to get started.

Why Use Press Tools Instead of Traditional Methods?

Modern installations demand efficiency, reliability, and safety. Press tools offer all three — and more.

Time-Saving Benefits

Traditional soldering or threading can take a lot of time, especially in tight or hazardous environments. Pressing a joint, on the other hand, takes just seconds. No waiting for pipes to cool or adhesives to cure. It's a plug-and-play system once you're set up.

Enhanced Joint Security

Press joints are factory-tested to meet high-pressure standards. When used correctly, they provide leak-proof seals that are both robust and long-lasting. Plus, there's less room for human error compared to soldering.

Key Components of Rothenberger Press Tools

Understanding the parts of the tool is key to mastering its use.

Press Jaws

These are interchangeable jaws or rings that clamp around the fitting. Their size must match the pipe diameter. The jaws apply uniform pressure, ensuring a consistent, airtight seal.

Hydraulic Mechanism

The hydraulic motor (battery- or mains-powered) applies the high-pressure force necessary for cold pressing the fitting onto the pipe. This pressure is typically between 30-40kN, strong enough to deform metals like copper or steel.

Control Interface

Modern Rothenberger models feature LED displays, error messages, and battery level indicators. These make operation more intuitive and reduce the risk of misuse.

Types of Rothenberger Press Tools

Depending on your workload and access needs, Rothenberger offers a variety of models.

Manual Press Tools

These are rare today but still useful for tight spaces where electricity or batteries are impractical. They rely on physical force applied through levers.

Battery-Operated Press Tools

The most popular option. These tools offer cordless freedom and high power output. Batteries are usually lithium-ion and offer hundreds of presses per charge.

Corded Electric Models

Ideal for workshop settings where constant power is required. These models are typically more affordable than battery-powered options but less portable.

How Rothenberger Press Tools Work – Step-by-Step Process

Let’s break down how to use a press tool properly.

Step 1: Preparation and Pipe Cutting

Begin by measuring and cutting the pipe to the desired length. Use a pipe cutter for a clean, straight edge. Avoid using hacksaws as they leave burrs.

Step 2: Fitting Selection and Placement

Choose the correct fitting compatible with the pipe material. Slide the fitting onto the pipe fully, ensuring it’s properly aligned.

Step 3: Aligning the Press Jaw

Attach the correct size jaw to the tool. Position the jaw over the fitting’s press sleeve. The jaw should rest squarely over the intended press point.

Step 4: Activating the Press

Activate the tool via the trigger or button. The jaws will close under high pressure and compress the fitting onto the pipe. Once the cycle is complete, the tool will automatically release.

Compatible Materials for Pressing

Rothenberger press tools are designed to work with a range of materials.

Copper

Widely used in domestic plumbing and heating. Pressing copper is fast and ensures a strong seal.

Stainless Steel

Often used in commercial systems for added strength and corrosion resistance.

PEX Systems

While less common in the UK compared to copper, Rothenberger makes adapters for pressing PEX fittings with metal sleeves.

Common Applications in Plumbing and HVAC

• Domestic water supply systems

• Central heating installations

• Gas pipe installations (with appropriate certification)

• Air conditioning and refrigeration lines

Whether you're retrofitting or installing new systems, press tools improve reliability and speed.

Safety Features and Best Practices

Safety is baked into the Rothenberger tool design:

• Auto-shutdown: Prevents misuse when the battery is low or cycle isn’t complete

• Jaw recognition: Ensures the right tool is used for the fitting

• Overpressure protection: Prevents damage from accidental misuse

Best Practices Include:

• Always clean the pipe and fitting before pressing

• Use Rothenberger-approved fittings only

• Keep hands clear of moving jaws during operation

• Check calibration every 12 months

Maintenance and Longevity of Your Tool

Keeping your press tool in top shape means:

• Regularly cleaning and oiling the jaws

• Storing in a dry, dust-free case

• Replacing batteries after 500 charge cycles

• Getting annual calibration and servicing from an authorised dealer

Troubleshooting Common Issues

FAQs

1. Can Rothenberger press tools be used on gas lines?
Yes, but only with specific gas-rated fittings and proper certification.

2. How often should I service my press tool?
Once every 12 months or after 10,000 cycles — whichever comes first.

3. What’s the difference between M-profile and V-profile jaws?
They’re designed for different fitting systems. Always use the profile that matches your fitting brand.

4. Are press fittings reusable?
No. Once pressed, the fitting is permanently deformed and cannot be reused.

5. Can I use a press tool in wet conditions?
Not recommended unless the model is water-resistant and you're following safety precautions.

6. How many presses can a battery perform?
Most Rothenberger batteries offer between 200–400 presses per full charge.

Conclusion

Rothenberger press tools offer unmatched convenience, precision, and reliability for both novice and professional tradespeople. Their ease of use, coupled with strong, leak-free joints, has made them the industry standard in modern pipework. By understanding the tools, components, and best practices, even a beginner can achieve professional-grade results confidently.

Shop the Rothenberger Press Tool at PressIt