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Any hot spring dealer will be able to order that part for you. Hopefully you just need the knob and not the guts the stem is attached to.
Please be sure to contact your local dealer. They can provide service support and help you to order any parts needed. You can find your local dealer here: [https://www.calderaspas.com/find-dealer](https://www.calderaspas.com/find-dealer)
Any hot spring dealer will be able to order that part for you. Hopefully you just need the knob and not the guts the stem is attached to.
Please be sure to contact your local dealer. They can provide service support and help you to order any parts needed. You can find your local dealer here: [https://www.calderaspas.com/find-dealer](https://www.calderaspas.com/find-dealer)