Prima 6 ml Bottle Mount Vaccinator features an adjustable dose self-filling syringe with multiple bottle mount accessories. Includes two fast fit bottle mounts to fit most 100 ml and 250 ml bottles, providing a quick bottle changing system. Bottles can be changed by sliding out the used bottle and inserting a new full bottle. No lost or wasted medication. The fast fit bottle mount also acts as a bottle protector cage. Comes with 20 mm, 30 mm, and 33 mm bottle collars to fit most 100 ml and 250 ml bottles. Designed for use with disposable needles or D3 reusable needles. Dosage adjuster dials from .5 ml to 6 ml.