Do you currently have car insurance? Insurance is mandatory to drive in California Yes I have insurance. But please show me your best quotes. No, please help me find the best insurance. Question When loading compressed gas, the liquid discharge valves should be: Answers Closed. Greased. Open. Removed. Explanation Keep liquid discharge valves on a compressed gas tank closed, except when loading and unloading. Take a FREE Practice Test Now This questions appears in the following tests: Colorado HazMat , Florida HazMat , North Dakota HazMat , West Virginia HazMat ,