Z-Flex Z-Vent 4" Rain Cap Stainless Steel Venting. This cap prevents rain water from running down into your 4" stainless steel venting, which can damage your tankless water heater.
Z-Flex Z-Vent is rated AL29-4C and is approved for Category I (vertical only), II, III & IV applications and is designed for use with boilers, high efficiency gas and oil heaters and water heaters where cool flue gases are vented under pressure. Z-Vent contains a built-in, fail-safe gasket and locking band connection. No sealant is required.
