Dirty Bird Septic Vent Concealer, Granite Easily covers your ugly 4 inch septic vent pipe with a decorative birdbath Integrated user replaceable activated carbon filter controls odors UV stabilized low density polyethylene material is warranted for life against chipping or cracking Birdbath basin is designed with birds in mind and meets Audubon Society specifications With all venting in the pedestal, it can also be used as a base for a gazing ball, potted plant or statuary