Jacuzzi Whirlpool Bath Air Volume/On-Off Control Cup for Air Bellow (C841000) is a replacement control cup for compatible Jacuzzi Whirlpool Bath air volume or on/off control assemblies using an air bellow. It is intended for service work on compatible Jacuzzi Whirlpool Bath equipment where matching the original part style, size, and application is important for a clean repair. This part can help restore the fit, function, or appearance of the related assembly without replacing more of the system than necessary.Use this part to support proper fit and function of the control mechanism during service. Confirm control style and bellow compatibility before ordering. For best results, compare the existing component, equipment model, measurements, and part number before ordering or beginning installation. Replacement part for compatible Jacuzzi Whirlpool Bath equipment Designed for topsides service applications Helps restore proper fit, operation, or assembly condition Useful for repair, rebuild, replacement, or routine maintenance work Verify part number and compatibility before purchase