This is a classic heater union 2 inches. When I replaced the heater I got the threaded union from a plumbing shop and installed it. The union comes with a gasket and you can only get a fitting gasket with a union. But it was black and totally melted in the hot tub after a couple of years. Finding the leak was horrible.
So it is difficult to get a silicone gasket. Amazon has them for a horrendous price. None of the commercial plumbing shops have them. I finally went to a big pool parts place, and these things aren't labelled in the shop. He has hundreds of gaskets. I had all the measurements, especially that it was 3 inch OD. He finally gave me one for free.
The original gasket was flat but with an o-ring glued on one side. That holds the gasket in place as you try to put the union together. My flat gasket squirmed all over the place so I filled the channel with pure silicone and let it harden. Makes it a lot easier.
ps. Had I known I'd drive all over the place, I would have just got this. I may still need silicone on the other side.
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