My ideas on the top of the block
1) Acrylic, Lexan, Copper(and all alloys of copper, such as brass), and Andoized aluminum(unless the whole block of aluminum) are acceptable for use as the top of a waterblock. They will not corrode easily unless other metals are in the loop(keep in mind the anodized aluminum will not cause corrosion).
2) All tops should be attached with bolts and a liquid sealent or o-ring with ridge. It can also be soldered on.
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