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The PAN-OSTON End Cap (78787-H) shields an internal component or fitting from dirt, moisture, and impact damage, and secures the assembly against accidental disconnection. It is a direct cross-reference for 100509321. Installing the correct cover/cap restores proper function and helps avoid downstream wear on adjacent components.
You will receive the same product or an OEM-Equivalent that meets the highest standard of the OEM with warranty that will be a direct-fit. Manufactured with rigorous industry standards and certified in the USA with superior quality to the OEM.