The plug can be plugged and unplugged multiple times, suitable for long-term use. It is suitable for all sizes of one way valves,non return valves,check valves, oil supply valves, oil pumps, hand pumps and aluminum joints. It is suitable for all sizes of oil supply joints and hand pumps. Medium used: crude oil, gasoline, water, etc. Advantages: crude resistant, gasoline resistant and aging resistant., Manufacturer: LSIJN