#metering
https://www.cisolube.com/products/vl-1-metering-valves.html ↗

The VL-1, VL-1X series metering devices are for single-line, high-pressure centralized lubrication systems dispensing lubricants compatible with flouroelastomer packings and viscosity up to NLGI 2. Output is externally adjustable. An indicator pin permits visual check of metering device operation. Individual metering devices can be removed easily for inspection or replacement.

Characteristics of VL-1 grease metering valve
Shipped with manifolds from 1 to 6 ports (lubrication points)
Output is externally adjustable
Each indicator pin permits visual check of injector operation
Individual metering devices can be removed easily for inspection or replacement
Includes fitting for feed lines via alternate outlet port