Perko, 3-1/4 Od Lckr Ventilator, 0330DP2CHR

Chrome plated brass. Screw size is 6 R.H. Size: 3-1/4"..

$14.96

Perko, Chromalex Cowl Ventilator, 1312DP0CHR

Chrome plated zinc cowl with black plastic base. 3" duck threads into neck. Hose clamps not required..

$52.51

Perko, Cowl Ventilator, 0870DP0CHR

Chrome plated. 3" duct threads into neck. Hose clamps not required. Mouth opening is 7 square inches..

$64.90