Perko Cowl Ventilator - 3" Chrome Plated Zinc Alloy [0870DP0CHR]
Sea-Dog Stainless Steel Butterfly Vent - Center Knob - 4" [331440-1]
![Perko Cowl Ventilator - 3" Chrome Plated Zinc Alloy [0870DP0CHR] - Perko](http://www.shopmarshlainesy.com/cdn/shop/products/34433XL_{width}x.jpg?v=1571116662)
![Sea-Dog Stainless Steel Butterfly Vent - Center Knob - 4" [331440-1]](http://www.shopmarshlainesy.com/cdn/shop/products/77417XL_{width}x.jpg?v=1576109834)
