Parts › 4020 - Vacuum Gauge Image 1 of 1 4020 - Vacuum Gauge $27.00 Quantity: Purchase Added! You Might Also Like A120 - Flow Meter Upgrade Kit $496.47 4040 - Vacuum Transducer $253.00 4393 - Novus Humidity Sensor $318.57 2031 - Fan Motor (greasable bearings) $835.71 4408 - Busch Steel Vacuum Pump Cast Iron Port Plate and Parts $790.13