Hi SM.
At the moment, my 1 inch apart cross slits (as you would do) on my tubing are letting out bubbles. Though I wouldn't be surprised if later on I looked and one of the slits have moved and now no bubbles are coming out it. No matter what I do and how I manipulate this one slit, it manages to stop bubbling. I've thought of literally cutting out a piece of the tube to make a permanent opening but don't want to make any regrettable alterations especially to the tube.
What have you done to keep stubborn slits open? Unless you have and suggest literally cutting out a small piece of the tube?
Thanks.
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