Gambit
RMS Regular
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- where the sun always rises
the port on the one way valve you blocked, i think that is still needed to balance the one way valve - otherwise if it was true one way there would be no need for any vacuum connectors at all on it.
you could try and block both ports and see do you still get the hissing.
you could try and block both ports and see do you still get the hissing.