Duct manifolds are manufactured using corrosion-resistant ABS plastic. The this material prevent condensation making them ideal suited for use with heating/cooling air conditioning systems (temperature 0 to 65°C / 30 to 140°F). Comes in various sizes, & for High capacity indoor unit. The inside of the manifold is lined with a polyethylene foam insulating sheet that covers all the Spigots. Each side can contain 1 to 4 connections (spigots)of various sizes.