What action should be taken to verify a positive gas sniff reading?

To verify a positive gas sniff reading, applying a soapy solution is the appropriate action. This method is commonly used in the industry as it visually confirms the presence of gas leaks. When the soapy solution is applied to the area suspected of leaking, it will create bubbles if gas is escaping, thus providing direct evidence of a leak. This is a reliable and efficient way to verify whether the sniff reading indicates an actual gas leak.

Measuring the gas pressure is related to understanding the system's operation but does not directly confirm a leak based on a positive sniff reading. Replacing fittings immediately does not address the immediate need for verification and can lead to unnecessary costs and complications if the leak isn't confirmed. Contacting a gas company might be necessary for repairs or safety concerns, but it does not address the need for on-site verification of the leak. Therefore, applying a soapy solution is the most effective and immediate method for confirming a positive gas sniff reading.