The McAlpine 1.1/2" Black Anti‑Syphon Adaptor is a high‑quality plumbing component designed to prevent trap seal loss in basin and sink waste systems. Finished in a sleek black, it provides a modern, discreet appearance that complements contemporary bathroom and kitchen designs, especially where exposed pipework is used.

Syphonage occurs when negative pressure within the waste system pulls water out of the trap, allowing unpleasant odours to enter the room. This anti‑syphon adaptor allows air to enter the system at the right moment, stabilising pressure and maintaining the water seal. By protecting the trap seal, it ensures effective odour control and consistent drainage performance.

Designed for 1.1/2" waste systems, the adaptor integrates easily with a wide range of McAlpine and standard plumbing traps. Manufactured from durable, corrosion‑resistant materials, it offers long‑term reliability and performance in both domestic and light commercial environments. Compact and easy to fit, it provides an effective solution for preventing odour issues in systems with multiple appliances or shared waste lines.

Key Features & Benefits

• Function: Prevents syphonage by maintaining the trap’s water seal

• Design: Modern black finish for a stylish, discreet look

• 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 robust, corrosion‑resistant materials

• Installation: Simple to fit into new or existing pipework setups

• Reliability: Ideal for plumbing systems prone to negative pressure issues

Typical Uses

• Kitchen sink and bathroom basin waste systems

• Preventing odours in multi‑outlet or shared waste pipework

• Renovation and refurbishment projects

• New‑build residential plumbing installations

• Light commercial installations where trap performance is critical

The McAlpine 1.1/2" Black Anti‑Syphon Adaptor provides a dependable, stylish and long‑lasting solution for maintaining trap seal integrity—ensuring effective odour prevention and consistent drainage performance