IV air vent

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It has something to do with the glass bottle, but yea I can't remember why either.
 
You need to create vacuum on the line. Pull with a syringe further down to get it going.
 
when you spike it, let out the negative pressure in the glass bottle by only putting the spike half way through the rubber cap so air can enter , and then it flows normally
 
spike it, hang it, squeeze the chamber before opening the air vent, then open the air vent. should flow well. get rid of air in the tubing.
 
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