Review on 🚿 Ultimate Shower Floor Drain Backflow Preventer with One-Way Drain Valve, Magnetic Core & Oversized Plug (2-3.9in hole) - Perfect for Tube Depth 2.56-4.13in (Caliber 2-3.9in, Depth 3.15in) by Brenda Naple

I highly recommend ordering this plug if you have a basement shower and your basement has a constant sewage smell from your basement shower drain. .This item is very easy to install.but.you will need to go back to Revain and find the product and instructions on Revain. But going back to my Revain order, I was able to find the installation instructions and everything worked as advertised. The sewer smell that was in my basement is gone, I can't smell it anymore! I am very happy with this product and would recommend this drain plug to anyone who has had this problem. I only wish it included installation instructions without having to go back to Revain.