By sealed I mean to keep crap out and coolant in. Doesn't need to be air tight and shouldn't be or it won't siphon properly. I have used plastic water bottles with or without a cap with hole drilled for the hose. Must be half filled and hose to the bottom. Must be large enough for the coolant expelled, usually a cup or two. Should be secured so you don't loose it or the contents.
Datsun 510 Cooling Issue
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