Upper Rebuild Kit for A-21 & A-31 Aerators

Keep your aerator running at peak efficiency with this comprehensive Upper Rebuild Kit for A-21 and A-31 models. Designed to extend the operational life of your unit, this kit includes the essential components needed to refresh the upper assembly without replacing the entire system.

Whether you're maintaining a commercial pond aerator or a residential setup, this rebuild kit is a reliable solution for wear and tear in high-use systems. The included parts are manufactured to meet the original equipment specifications, ensuring a tight fit, proper function, and maximum airflow performance.

This kit is ideal for seasonal maintenance or unexpected equipment issues that call for a fast and dependable fix. With quality materials and straightforward installation, it helps you avoid costly downtime and supports consistent aeration for healthier water ecosystems.

What's Included:

• New diaphragm

• Top plate

• Screws

• Washers

• Replacement gaskets

All components are precisely engineered for compatibility with both the A-21 and A-31 models.

Features

Direct OEM Fit
Made to match A-21 and A-31 upper assembly specifications.

Complete Rebuild Set
Includes all key upper components—no need to source individual parts.

Long-Lasting Durability
Built with high-grade materials for extended service life.

Quick Installation
Designed for easy replacement with minimal tools required.

Improves Airflow Efficiency
Restores performance by renewing critical moving parts.