MCA4

Low Eff. Gas 83% or lower & Hot Water Applications. Gas Adapter Flex end will go into our BEST-Flex 5.5 inch, 6.5 inch, & 7.5 inch Aluminum Liners only. The bottom end goes OVER 6 inch, 7 inch, & 8 inch appliance outlets. Manufactured with Aluminum. Includes a transferrable 15 Year Warranty