Internal Backwater Valve,4-F 4" Float Model Flood-Guard for 4-inch Flood Drains,Drain Backflow Preventer for Sewer Flood Protection

Well made, works great. Because the old floor drain had rusted during the last 80 years the opening was larger than 2 inches. I used a 2 part epoxy putty to fill the gaps…after cleaning everything very well. If you are putting this in an old steel or cast iron floor drain, getting it to fit may take a little creativity, but this is a well made back flow preventer that will work in 2 inch or slightly larger floor drains.

After reading a few other reviews I decided to check the material type. Screws and spring are all nonmagnetic indicating they are stainless steel. Brass plates are also nonmagnetic, everything looks good. I loosened up the screws until they were just attached then pressed in the rubber sleeve until it was free from friction contact to the brass plates. I then was able to push the unit into the 4" pipe by hand. Then tightened the screws a little bit going across like you tighten lug nuts on a wheel. This is the second check valve like this I used. The first one worked good for 15 years, just decided it was time. My neighbors had backwash problems but I didn't. After removing the original valve I saw turds at the surface of the water... Flushed them down with a hose and was very happy I had a check valve in place.

I PURCHASED THESE FOR MY BASEMENT FLOOR DRAINS. BOTH DRAINS HAVE CONDENSATION LINES THAT DISCHARGE INTO THEM. THE FAULT I FOUND WAS THE SPRING WAS TOO TIGHT AND THE RUBBER STOPPER WOULD NOT ALLOW ANY WATER TO GO "DOWN". I HAD TO CUT A FEW COILS OFF THE SPRING TO ALLOW THE RUBBER STOPPER TO "HANG" SLIGHTLY DOWN. NOW THE CONDENSATION WILL GO DOWN. WE FINALLY HAD A BIG ENOUGH RAIN WITH LAST YEAR'S HURRICANE AND THEY WER PUT TO THE TEST. IT WASN'T A TOTAL SUCCESS, BUT DEFFENITELY BETTER THAN NO BACKFLOW DEVICE. A SMALL AMOUNT OF WATER SEEPED UP THROUGH THE FLOOR DRAINS, BUT DEFINATELY KEPT THE BASEMENT FROM FLOODING COMPLETELY. PROBABLY WOULD HAVE BEEN 100% IF I DIDN'T HAVE TO MAKE A MODIFICATION TO THEM.

Works great, both blocking water backup and smell.

Terrible design. As others mentioned, you can barely get it into the pipe because the screws have to be tightened enough so the pieces don’t fall apart. I also had the back valve rubber piece fall off the screw into the drain. Thankfully I was able to suck it out with the shop vac, otherwise I would have had a bigger problem on my hands. I had this installed in previously and it worked saving our basement twice. Only reason why I was switching is because it was corroded but then I remembered I put vinegar down the drain so that’s why. I’m going back to this one as it’s much better designed and the rubber piece has no chance of falling off into the drain. https://a.co/d/0aDouFYl

This seems like it will effective in preventing back flow in our floor drain. Water drainage, however, is VERY slow (it took about 1 minute to drain roughly two cups of water). It was easy to install: * tie string to prevent from slipping down pipe * loosen screws on edges * place down the pip * tighten screws

It does require you to cut the spring down if you want water to drain. The spring it comes with is pretty strong, and would require several inches of water to drain through it. I cut it down so that it barely seals. I bought a house where the basement had flooded from a back up of the city lines. I installed this in the basement floor drain after it happened to me and hoped for the best. I wasn't sure if it worked, but a year later I ended up having another back up, except it came up through my basement shower drain (being the next lowest point). The good news is that all the black stuff stayed in the shower pan. I'm buying a 2nd one for the shower now, and I'd like to think the toilet won't be the next place to back up. If a couple years go by and there's not another back up, I'd love to refinish the basement.

A+. I deal with basement back ups when the city streets flood. Sump pump is fine, storm sewer is issue a backflow valve in the yard would cost thousands to install. This worked great so far in my basement. Last time I would’ve had an issue it barely let any water seal past the gasket edges. Usually I’d have 2-4” in the basement under these circumstances. I can probably tighten it a little more again, but it was very tight to begin with. Hold it with 1 hand and start screwing the 4 screws in a circle. Once snug you can crank it tight. Lean edges as best as possible. Mine was cast iron so hard to clean. Fit well. Works well. Also best one I’ve seen to allow water to go in, and not clog it up.

Everything else I could find for this size range is simply not performing up to the expected degree. This one does the job and does the job well

I purchased the 3" version and it fit perfectly. I saw reviews saying they could not control the water going down. There is nothing to adjust really on this. The 4 screws around makes the rubber expand the form a solid seal inside the pipe so that it cannot just be pulled or pushed out. The middle screw should not have to be adjusted. The water goes down with weight. If you have a cup of water it will not go down so press the button and down it goes but if there is a bucket, the weight pushes it down and allows it to drain. Hope this makes sense. For me, it works perfectly and what I needed. I installed one in a garage drain and now will order a second for the laundry room drain. Depending where you are and your situation, you could use these instead of putting a main one where you will have to dig. In my case there are only two small drains in the basement so it makes sense.

Efficacité de ce produit pour éviter des travaux supplémentaire

Very easy to install in my 3 inch PVC floor drain but the protruded spring pin is too easy to be bent such that you'd have to install the set way below the floor level, a little harder to fix the screws

Noticed it as soon as it was opened...... the spring is way too rigid and would prevent water from draining properly.....so any water accumulating from your shower (or other drainage issue) would not drain or would take a lot of time to drain, which can be just as hazardous....