A milk claw forms a very important part of a milking sytem, as it's where the suction cups attach to the rest of the line. The milking system is divided into the milking side and the pulsator side. When the system is turned on, vacuum is created everywhere by a vacuum pump that removes air from the system. When the cows are not attached to the milking system, the vacuum created will be the same on both the milking side and the pulsator side of the system. When the cows are attached to the milking system by the milking claws, milk and vacuum are present on the milking side. This will cause the vacuum on the milking side of the system to be somewhat lower than the vacuum on the pulsator side. The easiest way to understand the milking system is to look at the action taking place at the teat cup level. There are 4 teat cups with liners attached to the milking claw. The area between the liner and the claw is part of the pulsator side of the system. The area between the teat and the liner is on the milking side of the system. The pulsators are devices that sit on top of the pulsator lines on the pulsator side of the system. They alternately expose the area between the liner and the shell to air and vacuum. Agricultural machinery can be a big investment. That's why repairing farm equipment is typically better than replacing those small but expensive parts. You can learn more about Tech-Bond products or purchase your own Basic Poly Kit, as shown in the video, by visiting www.tbbonding.com You might also be interested in our videos on PVC repair: www.youtube.com/watch?v=Md9V_zTsA6U Boot repair: www.youtube.com/watch?v=nRANvZQxvBk and how to repair pot metal without welding: www.youtube.com/watch?v=Eze6g5MXwV4&t=1s