Surflo make a hush kit for their pumps - a very flexible soft line, You can also buy 1/2" pipe insulation put it around the lines next to the pump. You can buy a section of "cow pad" (Tractor Supply sells it) and put it under the pump. Lastly you can insulate the compartment where the pump is located. Just be sure to allow for sufficient cooling. An accumulator will not quite the pump but does lesson the frequency of it operation. Usually it is not the pump but the un-tethered PEX lines attached to the pump making the noise.
I highly recommend RecPro for any RV upgrades.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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