What do you mean? getting a steel tap or using a 1/2 tappered steel BSPT barb?
I think brass works well enough for that. Im happy with the brss for my own blocks but it appears I might be able to make some for selling, in which case I would get a proper tap.
I think polyethelene is definatly a v good material for the tops of blocks, the only downside is that it is translucent and doesnt bond well. Its good points are it is not at all brittle, cuts like butter,non absorbant, self lubricating, and strong.
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