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Yes, but the moment you shut it off, the water will run in there again.
The idea of a siphon break is a wee valve at the top of a raised loop. The valve stays shut if the coolant water pressure inside the pipe is higher than outside (engine running), but opens promptly if the opposite is true (engine shut and coolant racing away (both directions) from the top of the loop. When it opens, the circuit can only draw air, and not water. If it can draw water, there is a risk that the engine can get filled up when shut off.
You have to service them once in a while, as it is claimed they get fouled with salt, and stick shut. If they stick open, it is obvious.... they just squirt water up and everywhere.
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