Leaving the 1"-20 male fitting on your propane adapter uncovered exposes the threads and seal to dirt or damage. This cap covers the connection between uses, while the attached strap keeps it with the fitting.
When nothing is connected to the 1"-20 male fitting on your propane adapter, its threads and sealing surface are exposed to dirt and contact with other equipment. Contamination or damage can keep the connection from sealing properly the next time you use it, creating a propane leak. This cap covers the fitting between uses, and the attached strap keeps the cap with your propane setup when it's removed.
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