I used to not have pressure issues (due to temperature changes) as there was a vent in the transmission/radiator cap, but now I use a "plastic" res and didn't want to risk anything, so I put a tube over the vent and inserted the tip of an old eye drop bottle to allow it to vent, but the dust didn't get into the loop. The only problem is when I lay the body flat (when cleaning/machining) sometimes a few drops of coolant come out so I wanted a real pressure valve as they tend to have pin sized holes that don't 'leak' a single one. ". drops, so I have it. It works, but it's a joke that there's some water cooling to keep water from escaping the circuit, but TT says it can leak if the circuit is tilted for the water to reach it. I'll order another one and leave that one as a backup, other loop.
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