BAK BAKFlip G2 04-14 F150 5'7" w/out Cargo Management System 226309 hard part Two O-rings are used to

Two O-rings are used to seal vital components from the elements making for extended time between service intervals

3 inch air inlet/outlet

Pipe Diameter: 3" Split Into Dual 2

This is a VERY common practice

BAK BAKFlip G2 04-14 F150 5'7" w/out Cargo Management System 226309 hard part Two O-rings are used toBAKFlip G2 Hard Folding Truck Bed Cover 2004 2014 Ford F 150 5' 7" Bed without Cargo Management System Durable, solid core panels with aluminum skins Aircraft grade aluminum construction 300 lbs. weight capacity (evenly distributed) Patented rail and clamp system Intuitive automatic slam latches Full bed access when folded and secured against the cab Corrosion resistant semi gloss black finish Premium EPDM rubber perimeter seals Integrated water