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Toilet Tank Bank

Item #: N3137

List price: $5.99

Our price: $3.95 You save $2.04 (34%)

Save up to 0.8 gallons per flush with no loss in performance. Fill this plastic bag with water and hang it in the toilet reservoir/tank. It will displace an amount of water equivalent to 0.8 gallons, which means every flush will use less water. read more

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  • Buy 3 for $3.39 each and save 15%


Lead time: 1-2 Business Days

Our Price: $3.95


The Tank Bank is the easiest device to use to save water. Simply fill to top, snap to close and hang in toilet tank.


  • Every flush saves water - up to 0.8 gallons per flush!
  • Constructed of non-corrosive, odor-resistant materials
  • Patented air lock & fill valve - no water evaporation, bag never needs refilling

In keeping with our mission to help our site visitors reduce their environmental impact, it is possible to achieve similar results by simply placing a few bricks inside the tank.

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We want you to be completely satisfied with every purchase you make. If you are in any way dissatisfied with a product you ordered, we'll exchange it, replace it or refund your money within 30 days of purchase. Simply email us the problem, and we'll take care of you. Certain products have extended warranties (up to 50 years!) that are listed on the particular product page. Please call us at 1-888-451-6752 if you need further clarification.

Additional Information

Weight 2 oz
Key Feature Reduces the amount of water you flush down the toilet

Shipping Information

Shipping Details:
Insured against damage or loss while in transit
This Product Ships To:
US & Canada
Ships Via:
Fedex, UPS, or USPS

Questions about the Toilet Tank Bank

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  • From Aine at 2/9/17 4:59 PM
    • If I put this into a toilet that uses 1.6 gallons per flush already, is the 0.8 gallon flush going to do the job or is this a retrofit for older toilets?
      Thanks, Aine
    • Your newer toilet may already be flushing with just the right amount of water, but it's worth a try depending on its design and average waste per flush. This is primarily a retrofit for older toilets.
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