In a tight space, you need modern solutions to maximize flexibility. The SinkPositive GreenFlow Toilet Tank Sink is the perfect space-saving solution for small bathrooms, tiny homes, RVs, and the eco-conscious. This sink replaces your toilet tank cover and uses the tank's refilling operation to pump fresh water to the sink faucet - draining the used water into the toilet tank for flushing. Our lifetime warranty guarantees the durability of this sink for as long as you own it.
Dimensions: 17" x 9
Perfect for small bathrooms, tiny homes, RVs, and eco-conscious homes
Replaces existing toilet tank cover
Always pumps clean water through the faucet
Recycles used water from the sink into the toilet tank for flushing
Q:Can this fit over a tank that is 19 1/4 wide? How far does it adjust?
by|Jul 27, 2023
1 Answer
Answer This Question
A:Â Hi Christi! This sink is 18" wide and is not able to adjust, so it would unfortunately not work with your current dimensions.
by|Jul 31, 2023
Q:Is it easy to remove if you need to do repairs in the tank? Thanks!
by|Jul 3, 2023
1 Answer
Answer This Question
A:Â Hi Felix, these tanks are very easy to remove for repairs. They can be removed by lifting them off the toilet, the same as a standard tank!
by|Jul 5, 2023
Q:The video says to add putty to the corners. Does the putty come with it?
by|Jul 1, 2023
2 Answers
Answer This Question
A:Â Hi Sally, all kits will include putty for installation!
by|Jul 3, 2023
A: Yes it does—it’s that sticky tack stuff. It holds it in place but not super securely (shifts of bumped too hard), so consider using along the edges too in addition to the corners.Â
by|Jul 3, 2023
Q:Sinks need to have hot water in them to clean hands properly. Can you run a hot water line into the sink so it?s up to code?
by|Jan 4, 2023
2 Answers
Answer This Question
A: No. It uses the same cold water line that fills your toilet tank. Unless your hot water line is connected to your toilet. I’m not sure if the toilet valves are made to withstand hot temperatures as there’s no way to regulate hot and cold with this sink. This sink is probably not made to be used as a primary bathroom sink. It’s mostly for those small washrooms that are too small to fit a sink.Â
by|Jul 26, 2023
4 found this answer helpful
A:Â Studies show no difference in the removal of contamination from hands using cold water, warm water, and hot water: 25 seconds of any temperature water washing with soap is effective. Also few people wash hands long enough after using the restroom to get the tap to run warm.Â
That said, the simple answer to your question is no, you can’t run a hot water line to this sink. The point of this sink is saving water by washing using clean cold feed before it then drains into your toilet tank for the next flush. Also potentially avoiding adding plumbing for a sink if you have a stand alone basement toilet, for example. It functions from the toilet cold water feed line.
by|Sep 15, 2023
5 found this answer helpful
Showing 1-4 of 61
Customer Reviews
4.1 out of 5
(174)
4.1
out of 174 reviews
82% recommend this product
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Showing 1-10 of 174 reviews
Nov 29, 2022
for children's potty in tiny "closet" retrofit.
Installed this Sink Positive on a new HD Glacier Bay toilet & tank.
For a home DIY in a tiny closet that turned into a kids potty room.
Definitely neat and space saving. Useful for a kids sink. Only cold water (same as toilet line).
Operates "on" when the toilet is flushed. No shut off feature.
The Sink Positive is adjustable, for several tank styles, but I found it wobbles loosely, so I put some beads of caulk to glue the top sink to the toilet tank. ...
by
Recommended
1 found this review helpful
Nov 19, 2022
Best value of the options out there
I have a 15 inch wide toilet tank, but opted for this product rather than one built for smaller tanks because it has several advantages: deeper sink, aerator faucet, and most importantly, the drain doesn't just drip water into the tank, it directs it into the overflow pipe so that none of the soapy water enters the tank, only the bowl. Unfortunately, I could not use the adjusting slider piece because my tank was just a little too deep front to back for the lid to fit with the narrower measurement caused by inserting the slider piece. I dealt with omitting it by leveling the sink with a piece of weather stripping foam set on the tank rim. So the result is good, if a little off center. Maybe not the best installation, but it gets the job done and the deeper sink & aerator faucet means no splashing. Pretty happy with this, as I have been told several times that adding a sink to this super narrow toilet room would require some very costly plumbing. This addresses the hand washing issue and is something I could install myself. Installation was simple and worked the first time.
by
Verified Purchase
Oct 26, 2022
An inexpensive upgrade for a quarter bath
My quarter bath is now a half bath! I wish I had discovered this product years ago.
by
Verified Purchase
Recommended
Oct 7, 2020
Arrived on time.Well packaged. At first it seemed a bit flimsy and when put in didn't quite clic...
Arrived on time.Well packaged.
At first it seemed a bit flimsy and when put in didn't quite click in but a little pressure and it set in place. Quite the talk of the town. Very very happy with it.
by
Verified Purchase
Recommended
6 found this review helpful
Dec 10, 2019
I have a toilet in a really small space off of my kitchen. For years I've grappled with costly re...
I have a toilet in a really small space off of my kitchen. For years I've grappled with costly renovations to extend the walls to make room for a sink. Along comes SinkPositive. A godsend, and I love it! It's convenient, very easy to install, and provides more than enough running water to wash your hands. In addition there's a nice lip to sit a soap bottle atop. Yay! It would be awesome if it was sturdier but, okay.
by
Verified Purchase
Recommended
5 found this review helpful
Apr 24, 2018
Love this little plastic sink. Perfect for my pool house that only has space for a toilet. And ...
Love this little plastic sink. Perfect for my pool house that only has space for a toilet. And we are saving water, bonus!
by
Verified Purchase
Recommended
2 found this review helpful
Nov 8, 2017
I love this little sink it's perfect for my basement bathroom (5×7) definitely would recommend.
I love this little sink it's perfect for my basement bathroom (5×7) definitely would recommend.
by
Verified Purchase
Recommended
3 found this review helpful
Feb 8, 2017
We have now had this product for over two weeks. We are very pleased with it. It solved the probl...
We have now had this product for over two weeks. We are very pleased with it. It solved the problem of having the toilet and sink separated into different areas in our master bathroom. Despite some negative review about the quality of the sink, we were impressed with how well it was made. I was actually expecting the thickness of the sink to be less than it actually was. It was easy to install and we use it every day.
by
Verified Purchase
Recommended
4 found this review helpful
Oct 1, 2016
Happy with the toilet tank retrofit sink/faucet
As advertised this took very little time to install and it works great. I thought it was a little pricey until I looked at DIY options and by the time you get done buying all the parts, drilling etc. it wouldn't save me a thing. So get this if you want easy with no headaches.
by
DIY
Verified Purchase
Recommended
6 found this review helpful
Jan 19, 2016
Absolutely Love This
I absolutely love this sink. It does everything I wanted it to do. My only problem is with the 'feel/look' of it. It is light weight plastic and makes me wonder a little how sturdy it is. Over all we love it and it is a great conversation piece. It comes on 2-3 seconds after the toilet is flushed giving you plenty of time to lower the seat and get soap on your hands. So far we have been using it about 6 weeks and don't have a problem with splashing water on the walls and did not have to put up a backing to protect the walls. The soap sits on the side of the sink and the towel hangs beside the sink. Only when the grandkids come and use a LOT of soap do I notice the cloudy soapy look in the bowl water; so for now the grandkids are always remembering to wash their hand after a trip to the bathroom. It was installed very quickly and without special tools and worked the first time tried!