25 ft lengths of flexible ductwork designed to fit your Wine Guardian Cooling System. Designed to fit Wine Guardian ducting collars. The D025 & SS025 ¼ Ton units use a 8″ diameter ducting, the D050 & SS050 ½ Ton & D088 & SS088 1 Ton units use a 10″ diameter ducting, and the D200 & D088 2 Ton units use a 12″ diameter ducting.