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One post in the archives mentioned that it was 5/8", but for the life of me I couldn't get that size wrench on it. It looked like it would almost fit - no crud on the fittings to get in the way.:smash:
Could it be 16mm? I'm gonna go pick up some crow's feet to see if it'll make the job easier with it + a swivel - I just need to know if I need metric or standard.