Pack of 2 McAlpine R1M 21.5mm Universal Compression Pipe Couplers – 19-23mm

Features

This 21.5mm compression pipe coupler joins two lengths of overflow or condensate pipe without the need for solvent glue. Its universal compression design accommodates different pipe diameters, making it ideal for connecting older imperial pipework to modern metric systems.

• Pack of 2 genuine McAlpine R1M universal compression pipe couplers.
• Straight connector design for joining two lengths of pipe.
• Universal compression connections accommodate pipe diameters from 19mm to 23mm at either end.
• Suitable for standard 21.5mm metric overflow and condensate pipe.
• Compatible with older 3/4″ imperial overflow pipework.
• Connects grey push-fit overflow pipe to standard white solvent-weld pipe.
• Built-in pipe stops help position the pipe correctly within each connection.
• Mechanical compression connections create secure joints without solvent cement or glue.
• Can also accommodate 22mm or old 3/4″ copper tube for wastewater and discharge applications only.
• Ideal for overflow repairs, condensate pipework and joining mismatched pipe sizes.
• Supplied as a pair, ready for installation.

Technical Specifications

• Quantity: 2 complete compression couplers
• Brand: McAlpine
• Manufacturer Part Number: R1M
• Product Type: Universal straight compression coupler
• Colour: White
• Material: Polypropylene
• Connection Type: Universal compression
• Connection Size: 19mm – 23mm at both ends
• Nominal Pipe Size: 21.5mm metric / 3/4″ imperial
• Number of Connections: 2 per fitting
• Pipe Stop: Built-in
• Jointing Method: Mechanical compression
• Installation: No solvent cement or glue required
• Applications: Overflow pipes, boiler condensate lines and wastewater discharge
• Copper Compatibility: 22mm or old 3/4″ copper tube for wastewater/discharge only
• Pressurised Systems: Not recommended for pressurised pipework

Details

Joining older imperial overflow pipework to modern metric systems can be difficult, particularly when existing pipework uses different diameters or fitting types. These McAlpine R1M universal compression couplers provide a simple solution by accommodating pipe sizes from 19mm to 23mm.

Each fitting features two universal compression connections, allowing you to join different lengths of compatible pipework without using solvent cement. Furthermore, the built-in pipe stops help position the pipe securely inside each end of the connector.

The universal design makes these couplers particularly useful when converting older 3/4″ imperial overflow pipe to modern 21.5mm metric pipe. They can also connect grey push-fit overflow pipe to standard white solvent-weld pipe. As a result, you can repair or modify existing installations without replacing unnecessary sections of pipework.

You can also use these fittings with 22mm or old 3/4″ copper tube when connecting wastewater or discharge pipework. However, this application is not recommended for pressurised systems.

Important: These fittings are designed primarily for non-pressurised overflow, condensate and discharge applications. Although they can accommodate copper tube in suitable discharge applications, do not use them as a general-purpose pressurised plumbing connector. Check that your pipe measures between 19mm and 23mm externally before ordering.

Discover

Explore our full range of Universal Compression Overflow Fittings – CLICK HERE.