2oz vegetable glycerin.
This product is used to refill the vacuum gauge.
Refill through the plug at the top beneath the vent option.
Gauge should be about 2/3 full for most accurate reading.
Gauge should be open (vented) during system use and closed when moving system.
2oz vegetable glycerin only.
Vacuum gauge image for reference only.
To replace vacuum gauge please see this option:
https://simplepulse.com/products/vacuum-gauge-bottom-mount?_pos=7&_sid=2319b7a16&_ss=r
For gauge troubleshooting please email or call.