Imperial 4" Premium Intake Cap with Built-In Pest Guard Screen, Brown, PA-4B Easy to install residential fresh air intake vent cap Use to replace damaged intake hood cap Paintable plastic components contain UV stabilizer to reduce fading due to exposure to sunlight Built-in metal screen pest guard Fits a 4-inch pipe diameter/vent opening The outside dimensions of the cap cover plate is 6 x 6 Does not include tail pipe