Pentair Micro Cyclone Diffuser 956000

I was having trouble finding ANY information on sizes of the diffusers, elsewhere... I needed several different sizes for our spa. I contacted SpaCare, and within an our, I was conversing with an actual person, who affirmed the sizes we needed, thank you... I have installed all of them. I was replacing them because they would pop out on their own. The new units fixed that issue, but to my surprise... there was another benefit. That was that there was so much more bubbling coming from these jets now! I also tried one of the swirling jets, and THAT was a winner too. I will be ordering more, and couldn't be happier with my purchases!