In this closeup, you can see two things: first is the "mini" sump that I had built into the tank. It is about 1/4 inch deep and 3 inches in diameter. It will collect any heavy particles or small amounts of water that end up in the tank. In the middle of that I had provisions for a drain plug included. But for the plug I am using a Femco drain plug that allows me to very easily drain a cup or so of fluid at any time. What you are seeing is the dust cover as the actual valve mechanism is inside the tank and very safe from damage from road debris
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