Armstrong International A9330 Diaphragm and Washer R-410A Integrating this OEM-spec propeller fan

Integrating this OEM-spec propeller fan blade restores original airflow CFM ratings

or if you measure an open circuit across the limit terminals while the plenum is cool

What is the difference between A28AA-29 and A28AA-81

Avoid rotating the outer dial directly to prevent damaging the quartz gear train

catering specifically to professional HVACR and steam system installs

Armstrong International A9330 Diaphragm and Washer R-410A Integrating this OEM-spec propeller fanThe Armstrong International A9330 Diaphragm and Washer is a critical replacement component engineered specifically for high performance fluid control systems. Designed to restore the original sealing integrity of Armstrong Model 90, 91, 92, and 93 control valves, this kit ensures precise pressure regulation and consistent valve modulation. Manufactured using robust, industrial grade materials, the A9330 repair kit maintains high tensile strength and