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This was a topic in a recent issue of Trailer Life in the RV Clinic column. "Bob"(can't remember his last name) said it was due to a harmonic resonance in the regulator and/or pig tail fittings.I e-mailed him and asked if it was a safety issue or just an annoyance. He replied it was not a safety issue just an annoying sound. I gathered from what he said that one could spend a lot of time and possibly money repeatedly replacing parts that were developing this harmonic resonation. Since in our case we do not hear it in the rig, only when outside, we decided to just live with it for now. Best wishes, Jay and Kathy
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