PRM Filtration—Butner, North Carolina. 

Products featured in this video: PRM Vacuum Gauge 0 to -30"WC/0 to -2 inHg - Stainless Steel Case, Brass Internals 1/4 Inch NPT Back Mount: 

In this video, Mike shows how to zero or reset a liquid filled gauge by venting it. This simple process is sometimes required after these products are shipped via plane, as they experience a change in altitude and pressure.

This product and many more are available from PRM Filtration at shop.prmfiltration.com