Easy to assemble and can be combined to obtain the required installation height

Rugged Construction-Strong, durable galvanized steel outer pipe has internal spacing beads to assure a uniform insulating air space between pipe walls

Each end is die formed to assure uniform sizing for strong, easy to connect joints which resist wasteful handling and shipping damage

The inner aluminum pipe is attached to the outer pipe at only one end

This arrangement allows for differential expansion between the two pipes, eliminating operational noises

Snap together non-positional lock system

Lock Tab®-An alternative method to secure pipe when required by local code