According to the schematic, there should be a screw on cap for the water tank drain. I was sanitizing the system and had a constant leak.
I found a quick solution without having to buy the $89 PEX crimping tool. I installed a SharkBite 1/2-in Push-to-Connect dia Cap Push Fitting.
I was unaware they made these. It installed in seconds using the little orange plastic horseshoe tool.
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