Some water bottles have a white plastic rubber ring placed inside the lid. Although the rubber ring is small, if it is lost, it will seriously damage the sealing of the water bottle, causing water leakage when the water bottle is placed horizontally or upside down. In fact, vertical jacks such as claw jacks, hydraulic jacks, and hydraulic jacks also have a sealing ring inside the oil cylinder, which can prevent internal hydraulic oil from leaking out of the gap between the top cover and the cylinder barrel, and also prevent foreign objects from entering the hydraulic cylinder.

At present, the sealing ring colors of vertical jacks sold on the market include white, black, yellow, etc. It is the most important component in hydraulic cylinders and is usually set on the piston rod inside. After prolonged use, the sealing ring will experience aging, reduced elasticity, poor sealing, and oil overflow or leakage, seriously affecting the normal operation of the jack. The leaked oil will also pollute the environment and increase the difficulty of cleaning. At this point, the operator must replace the sealing ring with an equivalent model and specification in order to use the vertical jack normally.

The sealing ring inside the vertical jack and the oil cylinder are like hands and feet, inseparable and indispensable, playing a very important role in the process of lifting heavy objects.