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Open Closed Manual Shutoff Valve Manual Shutoff Valve Checking Gas Joints Manual Shutoff Valve Combination Gas Control Location NOTE: Never use an open flame to check for a leak. Apply a mixture of liquid soap and water to all joints. Bubbles forming show a leak. Correct all leaks at once. OPERATING HEATER: WARNING: Before lighting, smell all around the appliance area for gas. Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor. If you smell gas,