4" PelletVent Pro Black Clean-Out Tee Cap 4PVP-COB1 This clean-out tee cap is used as a replacement for your existing clean-out tee cap. The new PelletVent Pro tee Cap is a tight fit by design. We recommend using rubber gloves or a strap wrench to easily remove. Use with pellet oil corn and bio-fuel appliances Laser-welded super ferritic stainless steel inner walls and galvalume outer walls Outer diameter is 5/8" larger than inner diameter 1" clearance to combustibles No additional gaskets or sealants needed The precise fit of twist-lock connections is fast secure and leak resistant. Adaptability is provided by swivel elbow connections and multiple termination options Laser-welded double-wall pipe with a .012†inner wall of corrosion resistant stainless steel and a .018†laser-welded galvalume outer wall. Painted black exterior available. Primary metal-to-metal connection seals joint. Encapsulated O-ring provides a secondary seal.