Shower Floor Drain Backflow Preventer, Waterless Trap Seal, One Way Drain Valve Sewer Core (1.28-1.58 inch, Blue)

I bought a 120 year old farmhouse and in the garage, it has drains in the floor. However, this was the era before traps were put in these floor drains and as such, the smell was overwhelming. I saw these and wondered if they would really work.Seriously, I cannot say enough good things about this little gadget. It worked PERFECTLY! I really wondered if it would stop the smell, yet let water flow. Both happen flawlessly. Just be sure your order the correct size and when you insert it into the drain, be sure you don't get it curled. Even if your pipe curves like mine, it still will work. Just gently lay it in so the back flow preventer follows the contour.It will stop any and all sewer gas and smells instantly! I have poured a few gallons of water down to test it and the water flows without any restriction.This is one of the smallest things that has brought so much relief. Definite 5/5 star indeed.

This is a great product. After a bathroom renovation last year we have been struggling with sewer smell even though the p-trap was installed properly, etc. This inexpensive seal has stopped the smell for very little investment. LOVE IT

I bought this product a couple years earlier and it fit my shower drain, but this version did not

Did not fit my application

I had sewer fly’s in the shower. I bought this to remedy the situation. The device does the trick of keeping them out of the shower. After fitting it to the 2” drain, it wouldn’t drain water fast enough. I started cutting 1/4” pieces off the bottom. Not a whole lot of luck so I started cutting vertical. The is still some standing water after a 5-8 minute shower, but I can live with that.

Works great for what we needed! We were able to get it down below the floor level so our regular drain cover could be put back on and this backflow can't even be seen.

Great idea to prevent insects and odors

Works great for basement floor drain