The 18-29 Periscope is used for close clearance dryer transition duct.
It solves situations where the dryer needs to be closer to the wall and the outlet is within 18-29.
The smooth interior decreases air friction for excellent airflow.

Made of 2 x 6 rigid 26 gauge aluminum
One 4 male, crimped rotating snap-lock collar fits into wall outlet
One 4 female, draw band rotating collar fits over dryer outlet
Two sections telescopes from 18-29
Reaches the side of most dryers.
Sections are reversible for airflow the same or opposite
Meets clothes dryer manufacturer specifications
UL and non-UL versions