My in-ground gunite spa was recently resurfaced with pebble-tec and the crew "lost" my jets. I've attached a photo below before it was redone, but they appear to be standard 1" in size but have these short blue rubber things on the end of them. I've tried replacing them with standard Hayward SP1419E hydrostream jets but when I do that the spa doesn't produce any bubbles - as soon as I remove the SP1419E jets the bubbles come back immediately. I do not have a blower in my set up as it uses a passive venturi system similar to above-ground spas.
Any ideas where what these jets are or where I can find them?