Quote:
Originally Posted by Rusty Kramer
So do I need to tear out panels inside the lave cabinet to find the check valve?
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In our coach, and in pictures from other coaches, posted here, the check valve is usually reachable without having to disassemble the cabinetry. Open the door under the sink, then look up at the bottom of the sink, and then from there to the corners of the cabinet behind the sink. You should see two PEX pipes, with the check valve at the top, connecting both.