This nipple Although it is provided with a hexagonal, which is similar to the with & nbsp hexagonal, grease nipples, threaded. But do not be fooled, because the hexagon is not intended for application head. This nipple is intended solely for pressing. Opening for filling lubricant is placed at the bottom of craters, which is located on the top side oiler . This type oiler is manufactured according to standards DIN 3105 .