Banjo 2.00 Anti Vortex Vent Cap w/No Screen VC200. Banjo 2 Anti Vortex Vent Cap w/No Screen Banjo 2 Anti Vortex Vent Cap w/No Screen The Banjo 2 Anti Vortex Vent Cap Screen w/No Screen is used to prevent to prevent swirl at the bottom of your atmospheric tank. 2 Male NPT Glass Reinforced Polypropylene Optional Stainless Steel Screen available Vertical Water Storage Tanks