The McAlpine 1.1/4" White Anti‑Syphon Adaptor is a practical, high‑quality plumbing component designed to prevent syphonage in basin waste systems. Finished in clean white, it blends seamlessly with standard bathroom pipework and fittings, offering a discreet solution for maintaining trap seal integrity and preventing foul odours.

Syphonage can occur when negative pressure in the waste system pulls water out of the trap, leading to unpleasant smells entering the room. This adaptor helps maintain a consistent water seal by allowing air to enter the system when needed, protecting against unwanted syphonage and ensuring reliable drainage performance.

Designed for use with 1.1/4" waste connections, it is compatible with a wide range of McAlpine traps and standard plumbing setups. Durable, lightweight and easy to install, the adaptor is ideal for new installations, repairs and upgrades where maintaining trap performance is essential.

Key Features & Benefits

• Function: Prevents syphonage and helps maintain a proper trap water seal

• Design: Clean white finish that blends with standard bathroom pipework

• Compatibility: Suitable for 1.1/4" waste systems and McAlpine traps

• Performance: Reduces the risk of foul odours caused by seal loss

• Durability: Manufactured from robust, long‑lasting materials

• Installation: Simple to fit into new or existing waste systems

• Reliability: Ideal for systems where pressure fluctuations may cause trap disturbance

Typical Uses

• Basin waste systems in bathrooms and cloakrooms

• Preventing trap seal loss in shared or multi‑outlet plumbing

• Home renovations and bathroom upgrades

• New‑build domestic plumbing installations

• Light commercial washrooms

The McAlpine 1.1/4" White Anti‑Syphon Adaptor offers dependable odour protection, easy installation and long‑term reliability—making it a valuable addition to any basin waste system