Leaving a male POL fitting uncovered during storage or transport exposes its threads and sealing surface to dirt or damage. This brass female POL cap covers the fitting so it stays protected until you're ready to reconnect it.
When a propane pigtail, hogtail, or other male POL fitting is stored or transported while disconnected, its threads and sealing surface are exposed to dirt and contact with other equipment. Contamination or damage can keep the connection from sealing properly when you hook it back up, creating a propane leak. This brass cap covers the male POL fitting between uses to protect the surfaces that create the seal.
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