The inflow and outflow holes in the round profile should always be as high or as low as possible.
To prevent air pockets, and therefore non-galvanised spots, and to ensure that the excess zinc flows away, the holes should always be in the corners of the profile. In this case, the profile is round and the assembly holes can be used to determine what the top and bottom is. The inflow and outflow holes should therefore be drilled at high and as low as possible.
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