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The adapter fitting is ok. It is narrow and tapered at threads, so be careful not to crank this down too tight or it will snap inside your rocker. Also there is no oring or gasket supplied with this product.
It is 1/8" NPT, which is a tapered pipe thread. There is no o-ring or gasket needed, being brass and having a tapered thread it self-seals, just like standard pipe fittings. Thanks for your review!