Perko, Clam Shell Ventilator, 0339DP0CHR

Chrome plated brass. Screw size is 6. Cut Out: 1-5/8" x 2-1/2"Base: 4" x 3-3/4"..

$69.89

Perko, Cowl Ventilator, 0870DP0CHR

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

$62.99