Try putting some foam pipe insulation around the pex water lines in the compartment where the pump is. Those lines vibrate thus rattling make noise. You may also want to upgrade to a higher quality quieter pump.
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Scott & Julie
Northern Wisconsin
2021 Cruiser Air 27MK
2021 Ford F-250 XLT Premium
6.2L, 6 3/4 ft bed, FX4. Tow pkg.
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