Originally posted by caseih
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There's going to be that 5-10 psi below your nozzle body check valves in the boom still. That way the lines have some space if that anti-freeze starts to gel and expand on those -40 nights in January.
Draining your booms at least to remove that bit of pressure also keeps your tips from dripping in the shed every time it warms up and expands the liquid.
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