🔧 White 4-Inch Oatey 43904 PVC Backwater Valve for Improved SEO Review

This is a duct check valve. Every home needs it to keep sewage out of your bathroom/sink/toilet/drain in an emergency like a flood/hurricane or when your outdoor sewage system is repaired. If there ever is a financial crash, your sewer company will be out of a job and the sewage will eventually flow back into your home. This valve can save lives. and so incredibly easy and inexpensive. It should be "code" everywhere. Check if this is a code in your region.

I couldn't find this 4 inch item anywhere other than in PVC where the rest of the ABS sewer system is but no problem: use an all purpose cement. The existing line pipe necessitated the use of about 30 cm of ABS pipe to allow a 4 inch rubber grommet to connect the line upstream. It doesn't require a lot of pressure (hopefully) so it shouldn't be a problem. The block also serves as a sweep. The top cover of the inspection screw is located inside the 5" (or 6"?) OD flange so you can pull the…

This valve worked fantastic! Saved me from a flooded basement and patio. We've had storm after storm this spring and we have a large storm drain in our backyard to carry rainwater. During sustained heavy rains, it does not drain fast enough and the water sometimes reaches a depth of 6 feet. Well, our sunken deck drains into a ravine in our front yard. So when it retreats, it actually pushes the water back down the drain and starts filling up the sunken deck! This happened about a month ago and…