The Moto-Massage is a jet that automatically travels up and down to massage a person's back. The mixing of air and water in a jet along with a pliable spine causes the sweeping motion of the Moto-Massage. The intensity and speed of the Moto-Massage can be adjusted with the air control valve.
The Moto-Massage consists of a jet nozzle, water tube, threaded fitting, vertebrae and an air tube with an o-ring. The Moto-Massage is held in place by a special recess behind the spa shell. A guide body is used to assist in proper movement of the Moto-Massage.
73539 Dual Moto, Air Tube with O-Ring is for the following models:
| Make | Model | Date Range |
| Hot Spring | Grandee | 2005-Current |
| Hot Spring | Vista | 2004-2013 |
| Hot Spring | Envoy | 2005-Current |
| Hot Spring | Vanguard | 2005-Current |
| Hot Spring | Grandee NXT | 2014-Current |
| Hot Spring | Envoy NXT | 2014-Current |
| Hot Spring | Jetsetter NXT | 2014-Current |
| Hot Spring | Jetsetter | 2005-Current |
| Hot Spring | Prodigy | 2014-Current |
| Hot Spring | Sovereign | 2005-Current |
| Hot Spring | Accolade | 2005-2006 |
| Hot Spring | Aria | 2007-Current |
| Limelight | Gleam | 2013-Current |
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