Dirt or damage on an exposed propane flare fitting can keep it from sealing properly when you reconnect it, creating a propane leak. This 3/8" female flare cap covers the connection between uses to protect the sealing surface.
When a 3/8" male flare fitting is left uncovered, dirt can collect on the flare seat and the exposed connection can be damaged during storage or service. Contamination or damage on that sealing surface can keep the connection from sealing properly when you hook it back up, creating a propane leak. This brass cap covers the fitting between uses to protect the surface that creates the seal.
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