Our new 6" Poly-Air Odor Control Vent Stack Filter (PCF-PLVF-6) is designed to fit a 6" diameter vent pipe and can be adapted using an optional 4" adapter. This new vent pipe filter contains 5 pounds of activated carbon for those applications where a higher capacity filter is required. It can effectively remove offensive odors such as hydrogen sulfide in house vent pipes, lift station vent odors, portable toilet vent odors, mobile home vent odors, schools, and restaurants as well as many similar applications where odors are a nuisance.