I really don't like o-rings. Plan to put the o-rings in the box a couple of times before you can actually secure it, before you can actually screw the cartridge on. The internal pipe threads (FPT) are too loose and leaking. Use teflon and more teflon and maybe more to be safe. I've used TMAs from 1.25" to 1" and have had issues as the metal flanges are a little tight for a larger fitting.
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