Spa jet nozzles

[strategy400]

I have these on the jets in my spa, I'm wondering if I can upgrade to be able to to change the direction of the jet a little. The larger ring threads into the PVC which I'm assuming is the end of a standard Venturi tee. These seem like builder quality el cheapos and moving the "eyeball" part essentially does nothing. Any recommendations?

 

[mas985]

Those are actually eyeballs and not the spa jet nozzles. Jet nozzles are deep within the spa wall and most look like this:



But you can change the eyeballs to get some directionality. They make 1/2" & 3/4" eyeballs may help a little bit. They will narrow the jet flow a bit as well.

 

[strategy400]

Those are actually eyeballs and not the spa jet nozzles. Jet nozzles are deep within the spa wall and most look like this:

View attachment 593216

But you can change the eyeballs to get some directionality. They make 1/2" & 3/4" eyeballs may help a little bit. They will narrow the jet flow a bit as well.

OK eyeballs then. I did pull the nozzle you pictured out of one jet because it had a rock stuck in it. I see some of these eyeballs that have a 1/2 and 3/4 opening but concerned will they weaken the end result and do they effectively change the flow direction. Also, I see "1-1/2 Inch MIP Thread", not sure because the threaded portion of mine appears to measure 1 3/4. The ones I have you can adjust the eye all you want and there appears be no change of direction of the water flow.

 

[mas985]

The ID of 1 1/2" MIP Female thread is around 1 3/4".

As for weaking the jet, that is possible. There are a lot dynamics going on with spa jets. Reducing orifices will increase the exit velocity but also tends to decrease flow rate a bit as well due to higher head loss. The strength of a jet is proportional to the product of velocity and flow rate. However, your perception of that change could be better or worse. It is not always a straight forward assessment.