Black Plastic Roof Vent Lift Arm Knob (BVD042100) by Ventline®. If you’re looking to restore the proper air circulation and ventilation to prevent musty odors and mold growth in your RV, this top-notch product is a perfect solution to go. Crafted with utmost quality and reliability in mind, it will ensure the perfect fit and consistent, long-lasting functionality. So, if you need to replace your old or malfunctioning component for an affordable cost, this product is just the thing.
Before You Order
Compare the BVD042100 knob with your existing roof vent lift arm hardware and note that the specifications say no knob extension; the source does not state dimensions or broader model fit.
Frequently Asked Questions
What material and color are specified?
The source lists a black plastic knob.
Does it include a knob extension?
The specifications say no knob extension. Check the shape and attachment of your existing lift arm hardware.




