Response to There are a few spa air buttons which are longer than 2” threads but most are maybe 1/16” or 1/8” longer. The best bet is 9243-02 air button the threads on this one are 2 ¼” long. The nut is ½” thick, so it would not completely engage the threads, but it would still be able to engage ¼” long thread section and these are pretty fine threads, so that should be enough.
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