This is the Poly-Mart Tank Outlet - Tank Overflow Kit - 4". This Flanged 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 Tank Overflow Kit comes with the Overflow Fitting, Hardware, Rubber Gasket and an Overflow Screen!
Poly-Mart Overflow Outlets are offered in 3" & 4" sizes. Mozzie Stoppa High Flow Flap Valves fit directly into these outlets to make your Rainwater Tank insect-proof. These Tank Overflow Outlets are ideal for a flat surface like the dome flats on all Poly-Mart Tanks.
The 4? Flanged Tank Overflow Outlet uses a "ripple geometry" comb that allows the speed of the overflowing rainwater to be maximized. The combed circumference "breaks" the water surface and generates a higher outflow which is ideal for high rainfall events.Ships FREE with purchase of any Poly-Mart tank!!Features and Benefits
- Lead free PVC
- Low maintenance
- Flanged outlet has pre-molded holes for fixing
- Quick and easy installation
- Overflow Outlets can be fitted with Mozzie Stoppa Hi-Flow Flap Valves to insect proof the tank.
- To Install Tank Outlets, cut a hole into the wall of the tank using a hole saw. Insert the elbow end of the fitting into the hole and simply screw onto the tank wall with the provided hardware.
- *Poly-Mart 4" Tank Overflow Kit's requier a 4 1/2" hole saw for proper installation.