Tube adapter with core bore for 180 and 240 cc barrels

This special tube adapter has no internal thread, but just a core bore in order to manufacture any indivudial thread which might be needed.
With the tube adapter, a standard manufacture´s "collapsible" tube can be used in combination with a 180 or 240 cc cartridge retainer.

This makes it possible to use compressed air without having to squeeze the tube by hand.