Selkirk 4" Co-Linear Flex Connector (Direct-Temp for Pellet)Selkirk 4" Co Linear Flex Connector Use with Selkirk 3" aluminum Flexi Liner or equivalent. Direct Temp Pellet Direct Temp Pellet is a revolutionary, high performance venting system. This one of a kind concentric system is two vents in one. The single pipe design integrates both fresh air intake and flue gas exhaust for Pellet applications. Direct Temp Pellet is ideal for both sidewall and through the roof venting solutions. DT Pellet components are