The McAlpine 1.1/2" White Anti‑Syphon Adaptor is a practical and reliable plumbing component designed to prevent syphonage in sink and basin waste systems. Finished in clean white, it blends effortlessly with standard bathroom and kitchen pipework, providing an effective yet discreet solution for maintaining a proper trap water seal.

Syphonage occurs when negative pressure in the waste system pulls water out of the trap, leading to unpleasant odours entering the room. This adaptor prevents that by allowing air into the system when required, helping stabilise pressure and keeping the water seal intact. The result is consistent drainage performance and improved odour control.

Designed for compatibility with 1.1/2" waste systems, the adaptor fits easily with a variety of McAlpine and standard plumbing traps. Durable and corrosion‑resistant, it is built for long‑term reliability in both domestic and light commercial installations. Its compact, easy‑fit design makes it ideal for new installations, repairs or upgrades.

Key Features & Benefits

• Function: Prevents syphonage to maintain a secure and effective trap water seal

• Design: Clean white finish blends with standard pipework for a discreet appearance

• Compatibility: Suitable for 1.1/2" waste systems and compatible with McAlpine traps

• Performance: Helps prevent foul odours caused by trap seal loss

• Durability: Made from long‑lasting, corrosion‑resistant materials

• Installation: Straightforward to fit into new or existing plumbing systems

• Reliability: Ideal for systems prone to pressure fluctuations or multiple connected outlets

Typical Uses

• Kitchen sink and bathroom basin waste systems

• Preventing odour issues in shared or multi‑outlet waste lines

• Renovations, repairs and refurbishment projects

• New‑build domestic plumbing installations

• Light commercial washrooms and kitchens

The McAlpine 1.1/2" White Anti‑Syphon Adaptor provides dependable odour protection, long‑term durability and easy installation—making it a valuable component for maintaining effective waste system performance