Rectorseal SureSeal SS4009 4-Inch Floor Drain Trap Sealer, Black, 1-Pack

This is the only one that would work in my basement floor drain, as my drain curved right away. All other's were to long and would hit the curve . This fit perfect, the rubber sealed the drain tight, no more smell in my basement.

This was super easy to install and immediately blocked he smells that were coming through the floor drain. I also spilt some water down it slowly to make sure it drained.

Within one hour, smell is completely gone. Expensive but worth every penny.

I had an older model of this trap seal that worked well for two years. Then the flaps lost contact and started letting gas through. I emailed Rectorseal asking about repairing or replacing the flaps. They got back to me immediately (at 10PM) and offered to send me a replacement. This is expensive for a neoprene flap, but it works. And the redesign looks more durable than the one I eventually had trouble with. More importantly Rectorseal stood by their product, no questions asked.

This was exactly what I needed, but when I went to install it, the bottom part of the flapper just flew off. Luckily it didnt go down the drain. The bottom part is just press fit in 2 places and this is completely unreliable. There are two posts that look like they could have installed screws to keep this in place but there is nothing there. Im not sure if this is supposed to have screws, but from my 2 minutes of dealing with this part, it looks like there should be screws to keep this from falling apart. For a 50 dollar piece of plastic, this is a complete and utter failure. I would not trust this part to not break and fall into your drain. Do not buy this.

2015: The drain seal was installed in about 15 minutes (which included cleaning of the drain pipe at the top to ensure a complete seal. The smell was gone as soon as the seal was installed. We have had no issues with the seal and it has been 2 months.2024 update: This product lasted over 9 years before the sewer gas started leaking through the seal. I am replacing it with the same manufacturer's product. I am a very satisfied customer!

Doing it's job so far. Came quickly after I ordered. Have not had any odors in my laundry room since installing this trap.

size is not 4 inch, it will fit for a 4.5 inch strainer