NDS 6" Gray Channel End Cap. It is made of polyvinyl chloride, a type of plastic, and attaches directly to the channel to seal-no coupling needed. Use with solvent-weld glue for a water-tight connection.
WARNING: This product can expose you to chemicals, including Vinyl Chloride which is known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov