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    1. #15
      Join Date
      Nov 2010
      Location
      Ventura County CA
      Posts
      556
      Country Flag: United States
      The hissing is a vacuum leak indicating the drain is not closed off. The image seems to show just a hose barb with no sort of drain valve / petcock valve. You will need to either cap that during normal use or replace it with a petcock valve so it can be kept closed until you are ready to drain it.

      Clint - '70 Nova "restomod" cruiser & autocross family car




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