We found ourselves irrationally annoyed by the pump noise in our 2018 FC25FB. The Shurflow pump would do all its turning on and off and the solid pipes Airstream uses were happy to transmit that noise throughout the trailer. I threw the kitchen sink at it, so to speak, and now the noise is only about 25% of what it was. More of a humm.
1) Installed the Shurflow accumulator. Yeah, I know the pump manual says it doesn’t need one. Maybe not technically but the tank makes it much smoother when you turn on a faucet partially. Sometimes the pump won’t even kick on if you are just asking for a small amount of water. Ours is on the output of the pump below the closet.
2) Installed Shurflow’s silencing kit
.These are really just flexible hoses and the required fittings. It prevents the pump vibration from being transferred to the rest of the trailer’s plumbing.
3) Put 1/2” foam pipe insulation around those flexible pipes. You don’t want them to come in direct contact with anything else as they do vibrate as the pump runs. They are absorbing that pulsing.
Total cost under $100. Time, 2-3 hours.