Crankshaft breather

Antonio1913

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My stock air case has two opening for hoses one on the top and on the bottom. I have the storage container with the cap at the end and I understand the hose on the other end goes to the opening on the top but I see there’s another opening with a hose connected and that’s how I got it. Is this supposed to be left open and just keep it low to drain or should it have its own cap.
 
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