Ensure the efficiency and safety of your rainwater harvesting system with our 3" and 4" Flanged Tank Overflow Kits, the same Overflow Fitting installed on all Poly-Mart Rain Harvesting Tanks. Proper overflow management is crucial to prevent system failure, and this kit is designed to handle large volumes of water, ensuring that your tank can safely handle heavy rain events.

Critical Overflow Capacity: This flanged overflow fitting ensures that rainwater can exit your tank as quickly as it enters, especially when your tank is at maximum capacity. Proper overflow management is essential to prevent backups and potential system failure during heavy rainfall.
Designed for Rain Harvesting Tanks: Specifically engineered for use with Poly-Mart Rain Harvesting Tanks, this overflow kit is compatible with a wide range of tank sizes, providing reliable performance in any rainwater harvesting setup.
Durable Construction: Made from high-quality, weather-resistant materials, this overflow fitting is built to withstand the elements, ensuring long-lasting durability and consistent performance.
Easy Installation: The kit includes everything needed for straightforward installation, allowing you to easily upgrade your rainwater harvesting system and ensure it meets necessary overflow requirements.
System Protection: By ensuring that your tank has an adequately sized overflow, this kit helps protect your entire rainwater harvesting system from the risks of overfilling and potential damage during large rainstorms.
Versatile Application: Suitable for residential, commercial, and agricultural rainwater harvesting systems, this overflow kit provides essential protection across various setups.
Use the 3" Tank overflow with 100 gallon to 1150 gallon rainwater tanks and the 4" with 1500 gallon to 5000 gallon rainwater tanks.