For the following items, what size holes need to be drilled? Item no.: 81590 - Vent with Union Nut / lockable / 60 mm Item no.: 81596 - Vent with Union Nut / lockable / 45° / 60 mm Item no.: 81605 - Vent with Union Nut / 45° / 90 mm
Dear customer, they are unit specific, so you need to make the exact measurements once you have the units in your hands.
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