Z-Flex Z-Vent 4" Termination Coupling Stainless Steel Venting (2SVSTPF04) 4" Termination Coupling Stainless Steel Venting Termination coupling is the last piece in a horizontal venting system Has a bird screen to prevent animals from getting into your exhaust system Rated AL29-4C and is approved for Category I (vertical only), II, III & IV applications Contains a built-in, fail-safe gasket and locking band connection