This is on an old jacuzzi tub. I do not have any measurements, but will try to get estimates on the sizing and change the pic. The tub is a basic octagon with 4 jets. The jets are too loose to aim anymore. This tub has no blower, only air control. I would like to change out the jets in the spring and be able to run a blower. Any suggestions on replacement jets? Here is a pic of a jet without measurements.

You don't add a blower to a jet configuration.

Best thing is to replace the jets with something that will fit the hole size in the spa shell.

Ah, I see. So I guess a blower would use a separate type of jet? Perhaps this spring I'll finally be able to get aimable jets!

I've reworked these spas before.

And for the most part, you never even want to attempt to plumb a blower into a jet air intake - way too many variables to work with, not to mention having to satisfy blower air flow requirements to keep it from overheating.

Again - for the most part, most tubs use a blower on their own air injector circuit, totally separate from the jets. They're called air injectors. Most high line spas do not use them because a blower - to most folks, is of limited enjoyment - and serves to cool the water down more than to help any type of therapy means. Unless of course you just want more 'toys' on your tub.

More lights, imo would be better.

Thanks for that info. I didn't realize that.