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The Gow-Mac Gas Leak Detector Model 21-250 helps you find leaks quickly without risk of contaminating your GC system. Using liquids to detect gas leaks can be poor economy, especially in a capillary GC system. Even a small amount of liquid leak detector that seeps into a fitting, or through the septum, can damage your column. The GOW-MAC Model 21-250 gas leak detector can easily and quickly pinpoint gas leaks too small to detect with soap solution.