Stenner Main Shaft [Feed Rate Control Series 45/85M] is a genuine Stenner Pumps replacement part designed to restore adjustment control on compatible classic adjustable Stenner pump models. Chemical feeder systems depend on small connection, valve, and drive components working correctly, and replacing worn parts with the correct Stenner part number helps maintain consistent dosing and dependable system performance.Use part number UCFC5AD when matching this item to an existing Stenner pump, injection check valve, tubing connection, or feeder assembly. It is a practical choice for service technicians, facility maintenance teams, and pool or spa owners who need to keep automated chemical delivery equipment in working order without replacing a larger assembly unnecessarily. Includes the feed rate control assembly with shaft for compatible 45/85 applications Helps maintain accurate chemical dosing adjustment Useful when the original control is worn, damaged, or hard to operate Supports service repairs on pool and spa chemical feeder systems Designed for dependable operation when matched to the proper Stenner pump