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Makes sense. So you would just push it in, tighten it (which would press against the inside of the pipe). To take it out, you loosen it and it comes right out. Fits inside a 1.5 inch pipe. What's it called, where can I get one? I presume I can install it at the top of the air pipe ... is there...

The pipe is pretty much cut at the same level as the concrete. It's a sloppy cut, to be sure, but the top of the pipe is very close to the cover (which I removed to take the pictures). So if there is a valve, it must sit INSIDE the pipe. I don't recall ever seeing a valve ... but it is possible...

Oh. My vocabulary is wrong. Sorry, I'm a noob. Okay, this is NOT what I would have expected. I thought that as the jet orifice size decreased, the air line would back up more and more because it is adding back pressure. Poolbreh ... are you saying there might be some sort of valve that fit...

If I remove all the jets I have no backup problem. Pictures of the adjustable jets are here: Hot Tub Parts for Spas - Quality Spa Parts Company Four of these (one in each pipe exhausting water into the spa) provided enough back up pressure to send water into the Venturi. The jets with the...

We moved into our house 3 years ago. Our house has a 17 year old pool in good working order, which includes an attached 4 person spa, also in good working order. This is the first time I've lived in a house with a pool. We moved in at the end of the season. Before the next season we hired a...