The patented Inline Wolverine - Is a powerful septic odor vent filter that installs in the attic, "inline" of the existing roof vent pipe and fits all vent sizes ranging from 1-1/2-6 inches. The Inline Wolverine is designed with extreme cold climates in mind. It gets installed in an attic or crawl space. However, it can be installed in any climate where septic or sewer vent odor exists and the roof vent filter needs to be hidden, for example some Homeowner Association rules require it. It is also equipped to accept the installation of our optional, unique, screw in Saturation Indicator. The saturation indicator changes color to let you know when the carbon in your Inline Wolverine vent filter requires replacement. The Inline Wolverine septic vent odor filter utilizes a specially formulated, Catalytic carbon called Sulfursorb Plus that was specially developed for the removal of hydrogen sulfide (also known as H2S, the main source of sewer and septic gas odors), and other compounds from air streams. THE INSTALLATION OF OUR INLINE WOLVERINE REQUIRES THE REMOVAL OF A SECTION OF VENT PIPE. IT IS STRONGLY RECOMMENDED THAT YOU HIRE A PROFESSIONAL PLUMBER TO INSTALL THIS PRODUCT IF YOU HAVE A CAST IRON VENT PIPE.DO NOT ATTEMPT TO CUT A CAST IRON PIPE AS DAMAGE WILL RESULT. CUTTING OF CAST IRON PIPE REQUIRES SPECIAL TOOLS AND SKILLS AND MUST BE PERFORMED BY A PROFESSIONAL. Every Inline Wolverine carries a 90-day money back guarantee! The Inline Wolverine DESTROYS the odor or Your Money Back!