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Those connectors are exposed to 1. temperature 2. Pressure 3. Hydraulic oil; and for their wall thickness and material composition, they do fairly well for the amount of service they offer. The EPDM material deteriorates and becomes porous over time causing them to "weep" fluid. I changed mine after 150K + because of this "weeping" and I believe I have at least another 100K on the new ones. They cost me about $25 a piece.
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