My 2109S has it just inside the left front storage door. Open that door and there should be a storage panel to your left, slide it over and it should be right there.
Actually, mine is next to our refer, behind the port side rear double hinged door. It's very difficult to reach, as I want to remove it and place a flow thru. I'll use an external filter as they're much less prone to leaks and flooding.
Linear Mode
