One of these kits is required if you need to bypass a vent pipe or obstacle larger than six inches. It is also used to connect collectors that are on different roof levels or that are facing different directions into one row. It contains the parts necessary to connect the collectors to the pvc pipe between them. It features the cpvc pipe connector to connect 1. 5 inch or 2 inch pipe and the panel clamp assembly, which is a durable, specially-engineered clamp that never requires replacement and never needs to be tightened.