The piston is made of soft rubber so it seals nicely against the tube, and the inside of the tube is lubricated with a light oil to improve the seal.
Inside the tube that makes up the body of the pressure gauge, there is a small, tight-sealing piston much like the piston inside a bicycle pump. The inside of the tube is polished smooth.
When the pressure gauge is applied to the valve stem of a tire, the pressurized air from the tire rushes in and pushes the piston toward the right.
Specifications | |
Colour | Silver |
Size | 10-120PSI |
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