---
title: "Vacuum Caps — $156K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/automotive/vacuum-caps"
last_updated: "2026-08-06T16:18:08.828Z"
locale: en
meta:
description: "Niche score 45/100 · $156K/yr market · 102K searches/yr · $11.58 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 45/100 · $156K/yr market · 102K searches/yr · $11.58 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Vacuum Caps — $156K/yr Amazon US Niche (2026) - Flapen"
---
# **vacuum caps**
**Skip it**
Brand-locked demand (top 5 brands take 98% of clicks) — this niche doesn't clear our bar today.
Market size 33Growth 50Conversion 96Competition 23Returns 93Price range 36Avg price 47Brand share 4Review moat 72Quality gap 19
**Conversion**
**Incredible****13.2%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Great****1.1%**
return rate — above 5% kills the launch gate
**Review moat**
**Good****603.2**
avg incumbent reviews — the moat a new listing must climb
**Growth**
**Okay****+20.0%**
90-day search growth — must beat 0% to launch
**Avg price**
**Okay****$11.58**
avg listing price — sweet spot $15–$100
**Price range**
**Okay****$6.50–$19.79**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Market size**
**Okay****$156K**
$156K/yr · 102K searches
**Competition**
**Bad****72%**
top-5 click share — a locked-up shelf
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Brand share**
**Bad****98%**
top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, vacuum caps is a $156K/yr Amazon United States market (102K searches/yr). The top 5 brands hold 98% of demand. Verdict: Skip it — 45/100.
Data updated Jul 10, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **vacuum caps market data**
- **Units sold / yr**
- **13K–15K**
- avg 750–1,000/product
- **Revenue / yr**
- **$145K–$174K**
- units × avg price
- **Conversion rate**
- **13.2%**
- **Avg BSR**
- **#17**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **87%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **46 months**
- **Avg seller age**
- **168 days**
## **Competition & brand share**
The top 5 products capture 72% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**6 **—flat
**Sellers**
**23**
**Top-5 brand share**
**98%**
Top 20: 100%
**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 & seasonality**
Weekly Amazon search volume, last 104 weeks — +20.0% search growth over the last 90 days.
3K2KSpike '25Spike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.7×
[**Open Trend **](https://flapen.com/research/us/automotive/vacuum-caps/trend)
## **Top vacuum caps search terms**
- **vacuum caps**29K/yr+29.6%12.1% conv. - **vacuum line caps**11K/yr+15.9%16.2% conv. - **vacuum caps automotive**14K/yr+6.6%14.3% conv. - **rubber vacuum caps**7K/yr+16.8%11.0% conv. - **vacuum cap assortment**7K/yr+11.7%16.2% conv. - **vacuum plugs automotive**7K/yr+17.6%17.6% conv. - **vacuum plugs**5K/yr+4.9%14.0% conv. - **vacuum cap**5K/yr+10.5%11.1% conv. - **vacuum line plugs**5K/yr+23.6%11.3% conv. - **carburetor vacuum caps**4K/yr+46.8%17.1% conv. [**All search terms **](https://flapen.com/research/us/automotive/vacuum-caps/search-terms)
## **Top vacuum caps products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%10%$16K20%$31K30%$47K40%$62K101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 15 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**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**Easily**$9.09**4.7★1,386 rev](https://www.amazon.com/dp/B09XN2VSZM) [2**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**Easily**$6.93**4.7★373 rev](https://www.amazon.com/dp/B0CN8K5LGP) [3**BUSY-CORNER 80 Pieces Vacuum Cap Assortment Rubber Dropper ID from 5/32 to 3/8 Sizes Hose Caps Kit for Carburetor Manifold (Black)**BUSY-CORNER**$7.55**4.7★1,427 rev](https://www.amazon.com/dp/B08YZ55JTS) [4**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**BUSY-CORNER**$10.04**4.7★394 rev](https://www.amazon.com/dp/B0CX1NCHK8) [5**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**Easily**$16.01**4.6★361 rev](https://www.amazon.com/dp/B0BDG6V2L5)
**~~View all top sellers →~~**
### **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**Easily**$13.58**40 rev2y ago](https://www.amazon.com/dp/B0CZNNBZNM) [**115PCS Nylon Vacuum Connectors 63 PCS Assorted Vacuum Plugs Hose End Caps Assortment Kit Black**Easily**$14.81**105 rev2y ago](https://www.amazon.com/dp/B0CYSWKX45) [**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**BUSY-CORNER**$10.04**394 rev2y ago](https://www.amazon.com/dp/B0CX1NCHK8) [**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**MINIMARU**$18.45**44 rev2y ago](https://www.amazon.com/dp/B0CKP3ZLHT) [**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**Easily**$16.01**361 rev3y ago](https://www.amazon.com/dp/B0BDG6V2L5)
**~~View all new products →~~**
### **Trending**
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**BUIYLV**$9.21**4.7★**▲ 69%**](https://www.amazon.com/dp/B09879GX9L) [**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**ISPINNER**$6.98**4.6★**▲ 24%**](https://www.amazon.com/dp/B09Z6GJCCM) [**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**Easily**$6.93**4.7★**▲ 11%**](https://www.amazon.com/dp/B0CN8K5LGP) [**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**BUSY-CORNER**$16.81**4.7★**▲ 10%**](https://www.amazon.com/dp/B098PZNV56) [**115PCS Nylon Vacuum Connectors 63 PCS Assorted Vacuum Plugs Hose End Caps Assortment Kit Black**Easily**$14.81**4.7★**— 1%**](https://www.amazon.com/dp/B0CYSWKX45)
**~~View all trending →~~**
## **What buyers say about vacuum caps**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**31%
*“Good quality, nice selection of sizes, arrived on time”*
**Size-Overall**19%
*“They fit perfectly on multiple vehicles”*
**Advertised Vs Actual Product**18%
*“As advertised”*
**Value For Money**9%
*“Great value”*
**Efficiency**4%
*“Works perfect”*
**Ease Of Use**4%
*“Very handy and complet”*
**Durability**2%
*“Durable”*
**Correct Contents**2%
*“Just what I needed”*
**Socket/Port/Plug**2%
*“Yep they're plugs like they are supposed to be”*
**Material Quality**2%
*“High Quality Materials”*
### **What buyers complain about **
**Durability**43%
*“They are literally falling apart”*
**Leak-Proof**16%
*“practically fell off causing a major vacuum leak”*
**Quality-Overall**11%
*“these are cheap”*
**Rubber Quality**5%
*“Cheap rubber”*
**Hard Feel**4%
*“Too hard”*
**Material Quality**4%
*“I won't use these on my vehicles anymore because the material seems to crack in about 4 to 6 months”*
**Size-Overall**3%
*“Just wish they included more large sizes”*
**Stain Resistance**2%
*“these caps bio-digrade in a few months and become very rubber staining on hands, cloth etc”*
**Strength**2%
*“brittle falling apart”*
### **Top return reasons **
**Size-Overall**64%
**Defective Material/Parts**7%
**Functionality-Overall**5%
**Material Quality**4%
**Compatibility-Overall**4%
**Advertised Vs Actual Product**3%
**Value For Money**3%
**Rubber Quality**2%
**Quality-Overall**1%
**Flexibility**1%
## **Common questions**
- **Is vacuum caps profitable to sell on Amazon United States?**
- The niche generates $156K/yr across 15 tracked products. 90-day search growth is +20.0%. Flapen's verdict: Skip it (45/100).
- **How competitive is the vacuum caps niche?**
- 6 brands and 23 sellers compete. The top 5 products take 72% of clicks and top 5 brands hold 98% of demand.
- **What do buyers complain about in vacuum caps?**
- Top complaints mined from reviews: Durability, Leak-Proof, Quality-Overall. The return rate is 1.1%.
- **When does demand for vacuum caps peak?**
- Demand is steady year-round — the busiest month runs 1.7× the quietest.
- **What does it cost to enter the vacuum caps niche?**
- Listings span $6.50–$19.79; the average listing price is $11.58 (sweet spot $15–$100). The average incumbent carries 603 reviews — the moat a new listing must climb.
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