Vacuum Caps
FailThe top 5 brands take 98% of clicks, so Vacuum Caps is a Fail.
- Flapen Score
- 45 / 100Ranks 4,788 of 7,287 Automotive niches · −4 vs the category median of 4945
- Market size
- $156K/yr102K searches / yr
- 90-day growth
- +20.0%search demand this quarter
- Competition
- 72%top-5 click share · 6 brands · 23 sellers
Flapen Score
Vacuum Caps against its category
The dotted line is the Automotive average. Past it, Vacuum Caps is stronger. Inside it, weaker.
Market
The Vacuum Caps market on Amazon at a glance
Shoppers on Amazon United States searched for Vacuum Caps 102K times last year and spent an estimated $156K. The top 5 brands take 98% of clicks. Flapen scores it 45 out of 100, a Fail.
01 · Demand
An estimated 13.2% of those searches ended in a purchase.
Shoppers searched for this 102K times in the last 12 months. That counts every search on Amazon United States for this niche's terms. An estimated 13.2% of those searches ended in a purchase. Searches in the last 90 days moved +20.0% against the 90 days before. Searches, conversion and average price together put the market at an estimated $156K a year.
- Searches, last 12 months
- 102K
- Growth, 90 days vs prior 90
- +20.0%
- Conversion, latest week
- 13.2%
- Market size, estimated
- $156Ka year
- Peak month
- May1.7× the quietest month
- Top search term
- vacuum caps29K searches a year
02 · Price
A sale here is worth $11.58.
Listings sell for $11.58 on average, from $6.50 to $19.79. Amazon reports units sold in ranges. This niche sold 13K to 15K a year. The average listing sells 750 to 1,000 of them. At $11.58 that is $9K to $12K a year per listing.
- Average price
- $11.58under the $15 to $100 sweet spot
- Price range
- $6.50–$19.79
- Amazon United States median price
- $24.38across 115,062 niches
- Units sold a year
- 13K–15K
- Units per listing a year
- 750–1,000
- Revenue per listing a year
- $9K–$12K
- Returns
- 1.1%of orders · Amazon United States median 2.1%
03 · Entry bar
The bar here is low.
87% of listings pay for placement with sponsored ads. 100% ship with Prime. On an average day, 0.0% of listings are out of stock. The average listing ranks #17 within Fuel System. It carries 603 reviews at 4.69 stars, so a new listing needs social proof before a better product.
- Sponsored listings
- 87%
- Prime listings
- 100%
- Out of stock, average day
- 0.0%
- Average rank
- #17in Fuel System
- Average rating
- 4.69 starsAmazon United States average 4.42 stars
- Average reviews
- 603per listing
- Listings tracked
- 15
04 · Newcomers
Brands here are settling in.
The brands on the shelf have sold for 46 months on average, so the names here are settling in.
- Launched, last 12 months
- 0
- Successful launches
- 0Amazon's first-year sales bar
- Average brand age
- 46 months
Products
Top Vacuum Caps products & what they sell for
The products selling here, as shoppers see them on Amazon. Shelf share and sales are our estimates.
Prices and ratings read from Amazon on Jul 10, 2026. The live listing can differ.
Top sellers
by estimated 90-day click share
Rubber Vacuum Caps Plug Kit 102 PCS Assorted Vacuum Plugs Hose End Caps Assortment Kit for Carburetor Manifold Automotive 3/16 5/16 7/32 1/4 5/32 3/8
- Price
- $9.09
- Rating
- 4.7/5
- Reviews
- 1,386
- Age
- 4y ago

Rubber Vacuum Caps Plug Kit 63 PCS Assorted Vacuum Plugs Hose End Caps Assortment Kit for Carburetor Manifold Automotive 3/16 5/16 7/32 1/4 5/32 3/8 1/8
- Price
- $6.93
- Rating
- 4.7/5
- Reviews
- 373
- Age
- 4y ago

BUSY-CORNER 80 Pieces Vacuum Cap Assortment Rubber Dropper ID from 5/32 to 3/8 Sizes Hose Caps Kit for Carburetor Manifold (Black)
- Price
- $7.55
- Rating
- 4.7/5
- Reviews
- 1,427
- Age
- 5y ago

110 PCS Vacuum Caps Assortment Vacuum Plugs Hose End Cap Rubber Vacuum Caps Kit for Carburetor Manifold Automotive 3/16 5/16 7/32 1/4 5/32 3/8 1/8 1/2 5/8
- Price
- $10.04
- Rating
- 4.7/5
- Reviews
- 394
- Age
- 2y ago

Vacuum Caps Rubber Plug Kit - 202 PCS 8 Size Assorted Vacuum Plugs Hose End Caps Assortment Kit for Carburetor Manifold Automotive 3/16 5/16 7/32 1/4 5/32 3/8 1/8
- Price
- $16.01
- Rating
- 4.6/5
- Reviews
- 361
- Age
- 3y ago
Trending
estimated 90-day click momentum
80PCS Vacuum Hose Caps Connector Assortment 6 Sizes Black Rubber Cap Automotive Topomatic Replacement Parts for Carburetor Vacuum Plugs Intake Manifold Vacuum Fitting
- Price
- $9.21
- Rating
- 4.7/5
- Reviews
- 529
- Age
- 5y ago

ISPINNER 60pcs Rubber Vacuum Caps Assortment Kit Hose End Caps for Carburetor Manifold Automotive 3/16 5/32 7/32 1/4 5/16 3/8
- Price
- $6.98
- Rating
- 4.6/5
- Reviews
- 643
- Age
- 4y ago

Rubber Vacuum Caps Plug Kit 63 PCS Assorted Vacuum Plugs Hose End Caps Assortment Kit for Carburetor Manifold Automotive 3/16 5/16 7/32 1/4 5/32 3/8 1/8
- Price
- $6.93
- Rating
- 4.7/5
- Reviews
- 373
- Age
- 4y ago

BUSY-CORNER 120 Pieces Rubber Vacuum Cap Assortment 10 Sizes Tube OD from 1/8 to 1/2 Sizes Automotive Carb Line Hose Caps Kit for Carburetor Manifold
- Price
- $16.81
- Rating
- 4.7/5
- Reviews
- 243
- Age
- 5y ago

115PCS Nylon Vacuum Connectors 63 PCS Assorted Vacuum Plugs Hose End Caps Assortment Kit Black
- Price
- $14.81
- Rating
- 4.7/5
- Reviews
- 105
- Age
- 2y ago
Newest
by launch date
118 Pcs Vacuum Caps Assortment 10 Sizes Rubber Vacuum Caps Kit Vacuum Plugs Hose End Cap for Carburetor Manifold Automotive 3/16 5/16 7/32 1/4 5/32 3/8 1/8 1/2 5/8
- Price
- $13.58
- Rating
- 4.7/5
- Reviews
- 40
- Age
- 2y ago

115PCS Nylon Vacuum Connectors 63 PCS Assorted Vacuum Plugs Hose End Caps Assortment Kit Black
- Price
- $14.81
- Rating
- 4.7/5
- Reviews
- 105
- Age
- 2y ago

110 PCS Vacuum Caps Assortment Vacuum Plugs Hose End Cap Rubber Vacuum Caps Kit for Carburetor Manifold Automotive 3/16 5/16 7/32 1/4 5/32 3/8 1/8 1/2 5/8
- Price
- $10.04
- Rating
- 4.7/5
- Reviews
- 394
- Age
- 2y ago

Rubber Vacuum Cap 177-Piece 12 Sizes Assortment Set Automotive Carb Line & Hose Caps Kit for Carburetor Manifold Automotive 3/16 5/16 1/4 5/32 3/8 1/8 1/2
- Price
- $18.45
- Rating
- 4.9/5
- Reviews
- 44
- Age
- 2y ago

Vacuum Caps Rubber Plug Kit - 202 PCS 8 Size Assorted Vacuum Plugs Hose End Caps Assortment Kit for Carburetor Manifold Automotive 3/16 5/16 7/32 1/4 5/32 3/8 1/8
- Price
- $16.01
- Rating
- 4.6/5
- Reviews
- 361
- Age
- 3y ago
Competition
Competition: brands, sellers & click share
The top 5 products take an estimated 72% of clicks. A locked shelf that new listings rarely crack.
Brands
6 flat
Sellers
23
Est. top-5 brand share
98%
Top 20: 100%
Est. top-5 click share
72%
Top 20: 100%
Open market
0%
- Easily59%
- BUSY-CORNER29%
- ISPINNER4%
- BUIYLV4%
- Dorman2%
- MINIMARU2%
- Open — no brand owns it (0%)
Demand
Vacuum Caps search demand
Weekly searches over the year, seasonality beneath. Pick a range.
No pronounced peak months · busiest ÷ quietest = 1.7×
Search terms
Top Vacuum Caps search terms shoppers use
The exact words shoppers type, with estimated yearly volume, growth, and conversion.
- vacuum caps29K/yr
- vacuum line caps11K/yr
- vacuum caps automotive14K/yr
- rubber vacuum caps7K/yr
- vacuum cap assortment7K/yr
- vacuum plugs automotive7K/yr
- vacuum plugs5K/yr
- vacuum cap5K/yr
- vacuum line plugs5K/yr
- carburetor vacuum caps4K/yr
Reviews and returns
What reviews say buyers love and hate about Vacuum Caps
We read the reviews and the return reasons for every product selling here.
“They are literally falling apart”
Every topic
Every topic buyers talk about, one row each.
Red shows the share of negative reviews and green the share of positive reviews, biggest topic first. Open a row to read what they wrote.
19 topics
Keep looking
Related niches
Niches in the same category that score near this one. Research these next.
Best Flapen score
The highest-scoring niches we track right now, across every category.
FAQ
Common Vacuum Caps questions
Answered from the same tracked data.
Figures on this page are estimates modeled from public Amazon pages and third-party keyword data. Amazon does not supply them, and no connected seller's data is used. How we handle Amazon data









