When I did doghouse I used a piece of leftover dynamat and put it under the pump. I then used some rubber washers on the screws to help reduce vibration through the mounting screws to the storage compartment floor. Not perfect but it did reduce the noise inside the coach.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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