Selkirk 3"/4"/5" Double Wall Increaser (Round - Type B Gas Vent) Size:5" to 6" Crafted in durable and heat-radiating

Crafted in durable and heat-radiating cast iron

to create an airy twist at the center

Same as RCK-K

Removes white deposits on gas appliance glass surfaces

Selkirk 3"/4"/5" Double Wall Increaser (Round - Type B Gas Vent) Size:5" to 6" Crafted in durable and heat-radiatingSelkirk 3" 4" 5" Double Wall Increaser (Model RV Type B Gas Vent) Used to increase pipe diameter. (RV) Round Type B Gas Vent Model RV Double Wall Gas Vent is the installer's choice for residential, industrial and light commercial applications. The aluminum liner heats up quickly to promote strong draft. Galvanized outer provides protection against outdoor elements. Product line includes DWC Double Wall Connectors and EFC Expandable Flex Connectors.