Apollo 24-300 Series bronze liquid level gauges are used in chemical processing plants, petroleum refineries and the pharmaceutical & manufacturing industries to determine the liquid level in a tank or vessel. These corrosion resistant and have PTFE seals to prevent leakage. These liquid level gauges are equipped with a clear glass tube, allowing visual inspection of the liquid level, and have MNPT ports for a secure connection. They have pressure ratings of 250 psig at 400 degreec F and 500 psig at 100 degrees F.