The Bel Air PZ-822B hot tub adds an extra foot of space and two additional water circuit therapy massage seats to exceed your rehabilitation needs. These additional seats place jets along the spine only for added lumbar therapy. Additionally, our whirlpool jet’s proprietary design also acts as a three port water diverter control valve. For an intense massage, divert water from passing through all the stainless steel hydrotherapy jets to only half in your seated area. For a delicate massage, switch the diverter valve back to allow the water to pass through all the jets. Or, divert the water to pass only through the whirlpool jet for an indirect massage and maximum filtration.