Amazon.com: Jeanoko Pneumatic Vacuum Regulator, Air Pressure Regulator Air Regulator Valve ABS ‑100 To ‑1.3Kpa with Dial for Industry Vacuum Regulator Valve Vacuum Pump Regulator : Industrial & Scientific
1/4" Vacuum Regulator - JHM Technologies, Inc.
Vacuum Regulator, 0 to 30" Hg, 2 cfm Max Capacity from Cole-Parmer