Marine City 4”Stainless Steel Round Butterfly Vent with Center Knob–Shutter Vent

The Marine City 4” Round Butterfly Vent with Center Knob is crafted from marine-grade 304 polished stainless steel, offering excellent resistance to corrosion, rust, and harsh marine conditions. Designed for smooth airflow control, the center knob shutter mechanism allows easy manual opening and closing of the vent.

This stainless steel butterfly vent is commonly used for marine companionway doors, cockpits, and cabin ventilation, while also being suitable for household sheds and utility spaces. Its sturdy construction ensures durability, reliability, and a clean professional appearance.

Installation is quick and straightforward, requiring no special tools or mechanical expertise. With a 4-inch diameter and 1 mm thickness, this vent delivers dependable ventilation for boats, yachts, and marine environments. Each package includes  Marine City Stainless Steel Round Butterfly Vent with Center Knob.

Key Features 

• Marine-Grade 304 Stainless Steel: Polished finish provides superior corrosion resistance and long-term durability

• Center Knob Shutter Design: Easily open or close the vent to control airflow with a smooth rotating center knob

• Wide Application Use: Ideal for companionway doors, cockpits, cabins, boats, yachts, and household sheds

• Easy Installation: Simple and secure mounting with no modification required

• Strong & Secure Fit: Designed to stay firmly in place and resist loosening in marine environments

• Package Includes: Marine City 4” Stainless Steel Round Butterfly Vent