Product Overview Mounted knob allows for easy adjustment of opening. Reviews (No reviews yet) Write a Review
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![Sea-Dog Stainless Steel Butterfly Vent - Center Knob - 4" [331440-1]](https://cdn11.bigcommerce.com/s-uotncpjkcp/images/stencil/500x659/products/273508/504075/full__45882.1733710554.jpg?c=1 "Sea-Dog Stainless Steel Butterfly Vent - Center Knob - 4\" [331440-1]")
