Supco
https://www.supco.com/web/supco_live/products/ECAP321.html
Faster and easier to install than double 90° elbows (P-Trap) Superior design, function and price to conventional concentric vents. Patent # 6,978,803. Resistant to heat, cold, precipitation or UV radiation. Protects furnace motor and interior from moisture, debris, and pests. Promotes unrestricted air flow of both Intake, and Vent flue.
DA: 5 PA: 50 MOZ Rank: 63