A method and apparatus of predicting link quality of a link are disclosed. A mouth or pouring piece may be plugged onto the spout, which forms a piercing cutter on the inner side of the spout, fitting therein in the form of a nipple. The computer determines one or more relationships of the one or more identified snapshots of the storage infrastructure. The female socket includes a waterproof stopper inside to stabilize the conducting wires going through the female socket and also to provide a waterproof function.