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Without using a BIG (inch and a half) T, what would be the best way to pipe the oil into the main line? I'm thinking of drilling/tapping a 1/4"npt hole into a nipple but we're not sure about "thread engagement rules."
Another BF is to machine our own weldolet and weld that to the main line..which I like.
PS: 1/8" weldolet might work also