Brass all the way. Length of nipple apparently doesn't matter that much - they all have the same length of thread, starting from the "head" end (according to one of the gurus, Schraner, I think it was).
@benbrangwyn started
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Brass all the way. Length of nipple apparently doesn't matter that much - they all have the same length of thread, starting from the "head" end (according to one of the gurus, Schraner, I think it was).