For the most corrosive media and environments use. Liquid filling helps absorb vibration and pressure spikes, increasing the service life of the gauge. The dampening action of the liquid also reduces pointer flutter and lubricates the internal parts. Features: 1) Size: available in size 1.5", 2", 2.5", 4" 2) Pressure range: 15 to 15,000psi 3) Vacuum, and compound available Inner packing: 1pc/ box ...