I fill mine through the tank drain. This bypasses the inline prressure regulator that is built into the "city" water inlet. I have been doing this since the coach was new in 2003. I do use a screw on pressure regulator on the external hose when I am not familiar with the pressure at the source.
Bob, wa7hra
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2003 Dolphin 5342, W-22 Chassis, 22.5" Tires w/a spare, Monroe Shocks. Ultrapower ECM Upgrade.
2004 Toyota RAV4 toad, 2wd, 5 speed. US Gear toad brake.
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