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Well you can double-check. Take the check valve off and blow on each side. My valve I can blow easily through one side, but not at all through the other, unless I put vacuum on the vac line, then I can blow through both sides.
That said, the gas cap on an s13 has a one-way check valve to allow air in so as to displace vacuum. S14s have a 2-way valve, though.
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