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Tank Overflow

Our low-fuss tank overflow kits offer a simple solution for mosquito-proofing your tank outlets and easily connecting them to standard plumbing fittings. Not only do they keep mosquitoes and other vermin out of your rainwater tank – they also offer the option to simultaneously increase your tank’s water storage capacity.

Product Families
Tank Overflow Kit High
Tank Overflow Kit High
90mm or 90mm (with Easy-Clean)
Standard Tank Overflow Kit
Standard Tank Overflow Kit
3 Sizes
Tank Overflow Kit Extra High
Tank Overflow Kit Extra High
90mm or 100mm
  • Benefits of Tank Overflow Kits
    • Keep mosquitoes, insects and other pests out of your rainwater tank
    • Allow you to fit standard plumbing fittings to your tank
    • Effectively manage overflowing water
    • Option to easily increase your tank’s water storage capacity
    • Promote tank ventilation and oxygen circulation
    • Make cleaning easy with spring-loaded hinge (Easy-Clean models)
    • AS4020 compliant
    • Range of sizes and types to suit different tanks and stormwater pipes
    • Kit form for easy installation
  • Tank Overflow Kit FAQ's
    • My tank is overflowing at the inlet rather than the outlet. What should I do?

    Check that your tank screen is free from debris, ie. leaves, sediment
    Your tank outlet may be restricted by a blocked Mozzie Stoppa or another obstruction.
    Check your overflow outlet for the presence of an obstruction and remove.
    Alternately, the level of your tank overflow may sit above the base of your tank inlet.
    Check that the outlet pipe is equal to or greater than the combind capacity of the pipe feeding your tank inlet
    If a Mozzie Stoppa is installed, remove, inspect and clean if necessary before reinstalling it at the outlet or replacing with a Mozzie Stoppa Easy-Clean.

    If your inlet/overflow issue persists, remove your tank screen and check for floating debris on the water surface. Floating debris such as sworf from the tank installation process’ may be blocking the Mozzie Stoppa during overflow and drifting away from the overflow when overflow has stopped.

    • Should I choose a regular tank overflow kit or a high level kit?

    High or extra high tank overflows offer a simple and effective way to increase your tank’s storage capacity.

    Whichever tank overflow product you choose to use, your overflow needs to sit below the base of your tank inlet screen. The advantage of the high level overflow is that it raises the maximum water level within the tank.

    • What size should I choose?

    The diameter of the overflow must be equal to or larger than the diameter of the inlet pipe.

    • What’s included in my tank overflow kit?

    Each tank overflow kit comes with a tank overflow outlet, mosquito-proof Mozzie Stoppa screen, a gasket and screws so you have everything you neeed for installation. The size of the components included in your kit will depend upon the product you order and are listed on each individual product page. (For product-specific information, visit the product page for your chosen tank overflow kit via the links above.)

    • Which way should I orient my high level overflow?

    The bend on your high level tank overflow should face up towards the top of your tank in order to increase your tank’s storage volume and overflow height.

    • Can I install my high level overflow sideways?

    Yes. We recommend installing your high level overflow with the bend facing directly upwards, however, it can also be installed on an angle to adjust the upper level. This may be necessary to ensure the overflow level stays below the base of your tank inlet and/or tank inlet screen.

    • Can I glue my Mozzie Stoppa Original in place?

    No. The Mozzie Stoppa Original (TATO05) is not self-cleaning, so it requires periodic removal and cleaning. The socket and spigot feature ribbing that provides a secure, non-glue fit. (For full installation instructions, see the Support page for your chosen tank overflow kit.)

    • Can I glue my Mozzie Stoppa Easy-Clean in place?

    Yes. (For full installation instructions, see the Support page for your chosen tank overflow kit.)

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