McAlpine 1 1/4" Anti Syphon Adjustable P Trap U Bend Bathroom Sink Basin SA10V. The SA10V by McAlpine is an 1 1/4" 32mm adjustable inlet P trap with an anti-syphon valve to help eliminate noises and gurgling.
When a bath, basin or shower empty into a common pipe, a vacuum can be created in the traps. Usually, a glugging sound will be heard and the basin etc. will be slow to empty. These anti-vacuum traps solve the problem by allowing air into the system through a one-way valve. McAlpine traps are very high quality and are multi-fit to enable fitting to existing pipework.
Easy to fit and well worth the money.
I wanted to stop the gurgling sound when water drains from my upstairs bathroom basin and after some research this waste trap has done the job. No more gurgling!