Blowers: A common mistake by customers is calling the "JET" pump a "blower". That is incorrect.

The "blower" is basically a reverse of an vacuum cleaner. Instead of sucking its blowing.  Instead of blowing water/air through jets, it only blows air.

Your blower can be either 115v or 230v. It normally sits by itself in a corner of the spa. From the blower is a hose that will have 2 loops in it or rigid piping that is again, basically 2 loops.

The purpose of the loops is to stop water flowing backward from the spa to the blower and harming it. Along with the 2 loops typically is a "check valve" at the blower. Jacuzzi used a spring loaded check valve to close the flow when the blower is off and open when the blower is on.

FYI: Most of Jacuzzi Whirlpools spas air blowers used flex hose to either 1 or 2 air channels or to a manifold. Air channels are built into the spa's mold and has simple holes drilled along the channel to allow air to blow into the spa. A manifold style has a number of small fittings mounted on the seating area to blow air through the channel and create bubbles. All of Jacuzzi's air blowers were single speed.