Found on hot tubs such as:
Chinese Spas, AMC Winer Spas, Trinity E-Zone, Monalisa, Cascade Spas
Additional notes:
Optional air switch, you can take the air switch out if you do not want to use it, or you can just leave it permanently on. As seen in this picture, this pump is mainly used as a booster pump but is also used as a circulation pump in some Chinese Hot Tub models.
