Description Features: Brand new and high quality Greatly improve the accuracy, save-time and convenient for operation. Great workmanship, with strict quality control and quality assurance. High safety factors, can be used with peace of mind. It is light in weight, small in size, convenient for you to store and manage, will not take-up too much space. A perfect and practical replacement part for hand operated Air pump, PCP pump, etc. Specifications: Material:Plastic Main Color: Black Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 15x O Ring 2x Screw 2x Plug Screw 1x Wrench 2x Spring 2x Sealing Ball 1x Three-Stage Piston Head 1x Silicone Oil 30ml