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Just a little smaller then the diameter of the thread on the nipples.The nipples should screw on tight-ish, but not over tight :)I think I used an off cut to make a couple of test holes to find the right size :)
Yeah sorry... I am sure they are a standard size of some kind of imperial measurement (got them from the US) I however I am in a part of the world that uses metric measurements, so I just tried until I found one that worked :)
I am sorry, I have no idea... Where we are we get a couple of frosty mornings in winter, but never proper freezing temperatures.
Electrolytic Rust Removal aka Magic
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