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I have the same problem on my 3811 MS. I finally opened up the crawl space and discovered that Keystone use 3/8” PEX tubing which has 5 times the pressure drop of 1/2 PEX. I’m seriously planning to replace certain lines like to shower with 1/2”. I’m going to start with the spaghetti behind the service panel as I believe half the loss is right there. All of my previous rigs have had 1/2 lines. It’s a shame that they cut corners now since the cost difference is probably less than $100.
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