Pangda 4 Pcs 6 ft Pipe Insulation Foam Tube Heat Preservation Insulated Foam Anti Slip Tubing Cover Wrap for Water and Air Conditioning Copper(Black, 0.35 x 0.39 x 70.8 inch, 4 Pcs) - Amazon.com
PATIKIL 6" HVAC Duct Manual Volume Damper, Metal Adjustment Airflow Ducting Backdraft Damper Control for Air Ventilation System - Amazon.com