NEW STYLE PUSH TAB. THIS WILL NOT WORK ON OLD STYLE TWIST & LOCK SYSTEM.
This is a 3" Pellet Chimney Stainless Steel Clean-OUt Tee Replacement Cap Only, this is from the PelletVent Pro-Line. It has the duralock tightening system, to get a tight fit. Use this clean-out tee cap as a replacement with the Tee.