This is on a old jacuzzi tub. I found a place that may sell the original unit, but I'm looking for other options. The box seems to have a built in check flap to prevent water from making its way out.


I've been looking at some of the various knobs on the SpaPartsNet store like this one.


Do those have any built in check valve or will I need to install an inline check valve with those?

Afaik, all air knobs come with check valves built in - but that's not going to be youre biggest problem - You will have to backyard engineer the fittings to go from 1" or whatever size down to the 3/8" to fit the hoses that are there.

Not a problem really, anything will work as long as it will fit the hole in the spa shell.

Ok. I'm not too concerned with adapting the hose size. That should be the easiest part of the job.