Sentinel Series Duct Collar for Models D025, DP25, DS025, SP25Description Composite duct collar with round outlet for connection to the condenser warm air exhaust on the Wine Guardian Sentinel Series models: D025, DP25, DS025, and SP25. The Sentinel Series duct collars feature a new stronger, double wall design. These duct collars insulate 42% more to help reduce temperature loss and condensation even in the most demanding environments. Integral captive quarter turn fasteners allow for ease of access and