Manissa - Radiator & Towel Rail Valve Pipe Reducer - 15mm to 8mm - Pair

Convert any 15mm radiator or towel warmer valve to fit 8mm pipework with this pair of pipe reducer...

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OnBuy.com15Mm To 8Mm Radiator & Towel Rail Valve Pipe Reducer (Pair) 1/2" Reducer Compression Fit 3233824112698
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Product Information

Full details

The Manissa 15mm to 8mm Pipe Reducer is an essential solution for homeowners and installers who need to connect 8mm pipework to standard 15mm radiator or towel warmer valves. Designed to bridge the gap between varying plumbing sizes, this pair of reducers offers a clean, professional finish for heating system updates. While it provides a robust seal for both copper and plastic piping, users should ensure their existing valves are compatible with standard 1/2-inch connections to avoid installation frustration.

All features

BrandManissa

Extended Product Information

FAQs

Can I use these for gas lines?

No, these reducers are specifically designed for radiator and towel rail water heating systems only.

Are these suitable for plastic pipes?

Yes, they are compatible with both copper and standard plastic heating pipework.

Do I need any extra sealant or tape?

The reducer is a compression-style fitting and generally does not require PTFE tape if installed correctly on clean pipework.

Will this work on a 22mm valve?

No, this is specifically for 15mm valves.

Is the pack quantity for one or two?

These come as a pair, enough to finish one radiator (inlet and outlet).

Troubleshooting

The connection is weeping water after installation.

Ensure the pipe was cut square and clean. Tighten the compression nut slightly further to compress the seal.

The reducer will not fit into the valve.

Verify that the valve is a standard 15mm 1/2-inch inlet and that no old olive or debris is obstructing the valve throat.

Pros and Cons

Pros

  • Enables connection of smaller 8mm pipes to standard radiators
  • Works reliably with both plastic and copper piping materials
  • Straightforward installation process for DIY or professional use
  • Provides a clean, professional look without needing adapters

Cons

  • Exclusively for 15mm to 8mm downsizing
  • Requires access to the valve locking ring for installation
  • Not intended for high-pressure industrial piping systems

Setup, Compatibility & Care

Before starting, ensure the heating system is fully drained and depressurized to avoid leaks.

  1. Loosen the compression nut on your 15mm radiator or towel rail valve.
  2. Ensure the olive and nut are positioned correctly on the 8mm pipe.
  3. Insert the Manissa reducer into the valve body.
  4. Slide the pipe and nut up to the reducer, ensuring it seats firmly.
  5. Tighten the nut securely to create a watertight seal.

Care instructions involve checking the connection for weeping after the system has been refilled and heated for the first time. If a slight drip appears, a small additional turn of the nut is usually sufficient to seat the reducer properly.

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