Polycarbonite straight Vetter snap vents made for a 3 1/4 inch hole from Craig Vetter of Vetter Design. The vent includes a metal wire to be used to pull the vent closed.
NOTE: There are cheaper versions on the market but we prefer to purchase from the designer and AMA Hall of Famer, Craig Vetter, who suffered serious injuries in 2015 after colliding with a deer when riding his streamlined Honda CN250 Helix scooter near to his home in California.
