The Pullet Tube with Spike has a filter which automatically lets air in if the spike is already inserted into a bottle. If the spike is inserted into a diluent bag, the self-collapsing nature of the bag, plus gravity, will also allow for easy flow of vaccine out and the filter does not allow any air in.
Pullet Tube with Spike
The Pullet Tube with Spike is mainly used to connect hanging bags to Marek’s pneumatic vaccinators.