Canplas Backwater Valve, 2-Inch

I feel so much more confident having this on the drain line from my kitchen. I live in a condominium complex and have neighbors upstairs. Our drain lines in the kitchen are connected so if they put grease or anything else that clogs up the line down their drain, the water backs up in my kitchen sink and dishwasher. I had been calling out the plumber 2x a year to clear the line to prevent it from effecting me before I found this product. I connected it to my drain lines myself. Product installed easily and installation is very straightforward. It's been 5 months and I haven't had any issues with drainage at all.

I like the ease of install and clean out. It’s gravity to close the inside door and opens with small amounts of water. This is not at your local hardware stores but should be. Great investment to protect a whirlpool tub of backup. Will probably buy again for the other bathroom remodel but since it’s not a whirlpool tub, really don’t need it.

Good product, fast shipping.

Easy to install and I’m hoping it will work in times of any water back flow in the future.

Product arrived quickly and exactly as ordered.

It seems well made with removable cap for cleaning. This is used to prevent a backup of sewerage into a sink.

Does the job without leaks. We've used for over two years with a problem.

I got this for a sprinkler pump suction line where I like the ability to open it (if I get mud build-up over time) as well as no pressure drop while flow is going thru. Unfortunately I found it jammed open one time when starting the system in the spring, and just heard of it allowing the system to be run dry again last week. Not sure exactly what caused it to allow reverse flow, but it's making me ask "Do I want to risk a $300 pump being run dry from a $20 valve failing?" My suction line application has it open and close each time the pump starts, if you just have it in the drain that 99% of the time has flow only going out, how sure are you it'll close when really needed? Also for those installs in drains, if it can fail with pretty clean water flowing that fills it, what about with gunk (soaps etc) that you're sending down the drain (and has time to sit/harden if the drain does go empty between uses)? I suppose anything is better than nothing if you're afraid of the back flow in drains, but hard to say if it'll be 100% reliable when expected.Update Sep 2021: I just cut this out and put in another check valve in the pump suction line. After closer looking at it, I see it has a rubber seal that is supposed to seal on the flat surface with the flap totally covering the inlet hole. What began happening in mine is the rubber seal (close to the flapper hinge) was going inside the inlet hole, and as the flapper tried to close it got wedged there preventing it from closing fully (there's a bend mark in the rubber from where it was in the hole vs out on each side). I don't see anything that made the rubber seal go into the hole that way except perhaps reversing water flow (that it should be able to handle), so seems a design issue more than "improper use" or such. That's my experience with it.