3" Tank Overflow Kit
3" Tank Overflow Kit - This flanged 3" Tank Overflow Kit is the Overflow Fitting installed on all Poly-Mart Rain Harvesting Tanks. There is a standard rule of thumb when plumbing your rain harvesting system. Rainwater has to be able to exit your tank (when it’s at maximum capacity) just as fast as it can enter the tank. If you do not have an adequate sized overflow, your system could back-up and fail during a large rain storm.
This above pictured 3" Tank Overflow Kit comes with the Overflow Fitting, Hardware, Rubber Gasket, Overflow Screen and Screws! If you can operate a drill and have a 3.75" Hole Saw, you can install the 3" Tank Overflow Kit. When drilling the hole in the Tank or Container, be sure to let the teeth on the hole saw do the work. Do not apply a bunch of pressure or else the drill will bind up, jump and make your wrists sore!
The Poly-Mart 3" Tank Overflow Kit is offered in 4″ version as well. Another accessory commonly sold with our 3" Tank Overflow Kit is the 3" Mozzie Stoppa™ High Flow Flap Valves. This is the Flap Valve installed at the end of the overflow pipe. Check out this picture below of a completely plumbed overflow:
These 3" Tank Overflow Outlets are ideal for a flat surface like the dome flats on all Poly-Mart Tanks. Installing on a round surface or the radius of a round tank could result in a leak.
3" Tank Overflow Kit Part Number: