Hsthe Sea 2pcs Shower Floor Drain Backflow Preventer-One Way Valve, Sewer Anti-Odor Cover Sealing Ring for Pipes Tubes in Toilet Bathroom KitchenPlug in magnetic suspension floor drain inner core

Great little item. Should have bought one sooner. Recently purchased for use with shower floor water drainer and fits quite snug in the hole inside the drainer,. Does need a little push to fit but is very secure and stops the smell of any odours coming out under drainage system.Tip for anyone who buys one also, pour some cleaning fluid down the floor drain first to help prevent any further odours etc and then fit the stopper.

Bought for fitting to a shower base as it had been plumbed into external drain without a non return valve resulting in some nasty smells. Didn’t expect much, but the smells have disappeared! Shower drains slower, but better than the smells