- Since this product is produced for egg hen, it only works up and down. 10 mm. made of stainless steel, 304 quality steel, with special conical screw. An 8 mm hole should be drilled in the place to attach. Nipple does not need to be opened at the point where it will be inserted since it will open itself. The nipple hill should be mounted by screwing upwards so that it does not fall. 0.80-0.90 ml / min. water.