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This replacement plastic dome assembly is made to seal the vent tight when it’s shut, keeping out water and debris. It directly replaces a broken or missing dome on the Ventline Vanair roof vent model VP-543, fixing leaks and restoring proper airflow control in one simple swap.
No guesswork needed—this dome is made to fit exactly like the original on your Ventline Vanair roof vent. It measures 8-1/2" overall and 1-3/4" high, so it lines up with the existing mounting holes and hardware without modification. The smoke-colored finish matches the stock look for a clean fit.
The dome includes the foam gasket already adhered in place, so it seals securely once mounted. The foam runs along the edge of the lid to keep out rain and drafts when the vent is closed. There’s no need to chase down a separate gasket—it’s built in and ready to go.
Made from tough plastic, this black dome holds up well against daily use and weather exposure. Its smooth, low-profile shape blends neatly with the roofline and keeps the vent protected without adding bulk or drag.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Speaker 1: Today we're taking a look at the Replacement Plastic Dome Assembly for Ventline Vanair Trailer Roof Vents. This replaces a broken assembly for your roof vent. It works with Ventline Vanair roof vent model VP-543. The dome assembly seals the vent when it is in the closed position. It's smoke in color, and it does come with the foam gasket pre-installed here at the base, and it comes with the necessary mounting hardware.A few measurements to go over with real quick, starting with the overall diameter. Outer edge to outer edge measures 8 and 1/2 inches.
The overall height is at 1 and 3/4 inches tall. You'll notice that is has two mount holes. Those mount holes are separated on center by about 6 and 1/2 inches, and the product is made in the USA. That's going to do it for today's look at the Replacement Plastic Dome Assembly for Ventline Vanair Trailer Roof Vents.
Customer Satisfaction Score:
100% were satisfied with this product
0% of customers were not satisfied
Ratings & Reviews
Laurence
3/12/2026
Good as new! After a year .
Andrew N.
3/12/2026
Pat R.
5/29/2026
Has not leaked since installation.
Tony R.
6/8/2023
Still good!
Fun S.
12/11/2017
The vent is performing just fine. No problems.
Mark
11/16/2023
It continues to work well after more than a year in use.
John L.
3/12/2019
Working great, NO leaks! Live in FL, very strong sun. Probably need to replace every few years, but reasonable cost and easy install. Glad I found the product.
Steve
9/24/2020
After a year it is still working perfectly. Keeps its setting even on very rough roads. Couldn’t be happier.
Tom
10/27/2022
The vent caps are holding up to being outside full time with no issues after one year.
Do you have a question about this RV Vents and Fan?
Info for this part was:
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John C.
10/29/2020
Vent Covers are working great, Gaskets holding up better than original vents.