Center Knob Butterfly Vent (4"/5")(Diameter:5") – Marine City Hardware

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Center Knob Butterfly Vent (4"/5")(Diameter:5")


Let the Center Knob Butterfly Vent, with its 5-inch diameter, be the perfect airway for your space! 
The Center Knob Butterfly Vent is the perfect addition to any home. With its impressive 4"/5" diameter, this vent provides superior air flow and ventilation for your home. Its unique center knob design allows for easy installation and operation, so you can rest assured that your space will be well-ventilated day in and day out. With its sleek look and ease of use, the Center Knob Butterfly Vent is a must-have for anyone looking to upgrade their living space with quality ventilation solutions. 

  • Center knob butterfly vent has a total diameter of 5 inches.
  • Vent can be installed in 4- or 5-inch pipes.
  • Butterfly plate connected to the center knob opens and shuts up the airflow
  • An efficient solution for regulating air flow in ventilation ducts, fans and bypasses.


• Made of Marine Grade 304 Polished Stainless Steel for maximum corrosion resistance and durability
• Commonly used for Marine Companionway Door, Cockpit, Cabin Ventilation, or use for a household shed or additions
• Easy to Turn Center Knob to open or close
• Dimensions : Thickness: 1mm 0.03" (0.8mm ); Diameter: 5"(127mm)
• Package contents: 1 pcs MARINE CITY Stainless Steel 5" Round Butterfly Vent with Center Knob Shutter Vent

About Us

Here at Marine City Hardware, we specialize in marine hardware products. We are all family and are all working together to bring our customers exactly what they need. Our motto is high quality, low prices, fast shipping, and taking care of our customers. Everything is double-checked and electronically tested before being sent out to ensure the highest quality. Our company provides retail and wholesale services so you may also contact us if you want to order our products in bulk as well. Our exceptional prices and superior manufacturing company make us the best around for any marine products. 100% Customer Satisfaction is our ultimate goal so we encourage you to message us because we will work for you.