Waterway 3-3/8-Inch Scallop Black Jet 212-8011

It is very hard to find any information about jets when are rebuilding one-ask question you get a answer but not what you ask about--for me this jet has a strong roto action with the air on--just what I want for my sore back--the double roto I thought would be better but the single I get more water and action this to strong for wife but are made to adjust--I like the waterway jets and buy extras in different configuration then move the jets around to where I want them--have bought over 14 jets and body's and this is my only review --because I use two in my seat full blast and sleep like a baby