---
title: "Ac Caps — $37K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/automotive/ac-caps"
last_updated: "2026-08-09T12:37:39.518Z"
locale: en
meta:
description: "Niche score 64/100 · $37K/yr market · 57K searches/yr. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 64/100 · $37K/yr market · 57K searches/yr. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Ac Caps — $37K/yr Amazon US Niche (2026) - Flapen"
---
# **ac caps**
**Worth a look**
Shows demand growing +160.6% this quarter, but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 9Growth 96Conversion 78Competition 59Returns 65Price range 31Avg price 23Brand share 84Review moat 94Quality gap 96
**Growth**
**Incredible****+160.6%**
90-day search growth — must beat 0% to launch
**Quality gap**
**Incredible****4.0★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Great****116.43**
avg incumbent reviews — the moat a new listing must climb
**Brand share**
**Great****51%**
top-5 brand share — no brand owns this niche
**Conversion**
**Great****7.8%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Good****2.4%**
return rate — above 5% kills the launch gate
**Competition**
**Good****50%**
top-5 click share — leaders hold, buyers still browse
**Price range**
**Okay****$3.49–$20.22**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Avg price**
**Bad****$8.26**
avg listing price — sweet spot $15–$100
**Market size**
**Bad****$37K**
$37K/yr · 57K searches
**Signals**[** Trending**](https://flapen.com/research/niches?market=us&signal=trending "Search growth > 100% (90d)") [** No Dominant Brand**](https://flapen.com/research/niches?market=us&signal=no_dominant_brand "Top brand's click share < 20%") [** Quality Gap**](https://flapen.com/research/niches?market=us&signal=quality_gap "Avg rating < 4.0")
According to Flapen's Amazon United States niche tracking, ac caps is a $37K/yr Amazon United States market (57K searches/yr). The top 5 brands hold 51% of demand. Demand peaks in Apr–May–Jun–Jul–Aug. Verdict: Worth a look — 64/100.
Data updated Jul 9, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **ac caps market data**
- **Units sold / yr**
- **4K–5K**
- avg 100–250/product
- **Revenue / yr**
- **$33K–$41K**
- units × avg price
- **Conversion rate**
- **7.8%**
- **Avg BSR**
- **#523**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **53%**
- **Out of stock**
- **1.4%**
- **Avg brand age**
- **26 months**
- **Avg seller age**
- **193 days**
## **Competition & brand share**
The top 5 products take 50% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**28 **▲rising
**Sellers**
**42**
**Top-5 brand share**
**51%**
Top 20: 92%
**Top-5 click share**
**50%**
Top 20: 89%
**Open market**
**43%**
- Dorman16% - Ferianl10% - KITUREK10% - Figpade9% - pinflaw7% - Dekiphox5%
## **Demand & seasonality**
Weekly Amazon search volume, last 102 weeks — +160.6% search growth over the last 90 days.
3K2KSpike '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Apr, May, Jun, Jul, Aug · busiest ÷ quietest = 10.8×
[**Open Trend **](https://flapen.com/research/us/automotive/ac-caps/trend)
## **Top ac caps search terms**
- **ac low pressure port cap**17K/yr+175.1%6.6% conv. - **ac caps**9K/yr+203.3%6.4% conv. - **ac service valve cap**7K/yr+92.3%3.3% conv. - **low pressure ac cap**3K/yr+363.5%9.5% conv. - **ac line caps**4K/yr+112.9%5.7% conv. - **ac caps for high and low 134a**3K/yr+266.4%7.5% conv. - **r134a cap**3K/yr+186.9%4.7% conv. - **ac valve cap**4K/yr+92.0%5.1% conv. - **ac cap**4K/yr+121.4%7.0% conv. - **ac valve caps**3K/yr+110.2%5.1% conv. [**All search terms **](https://flapen.com/research/us/automotive/ac-caps/search-terms)
## **Top ac 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%4%$1K8%$3K12%$4K16%$6K1101001K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 24 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Dorman 54374 Air Conditioning Service Port Caps Compatible with Select Models 2 Pack**Dorman**$7.65**4.5★638 rev](https://www.amazon.com/dp/B0BDR8BQ4N) [2**Ferianl 10PCS Air Conditioning Service AC System Charging Port Covers 0.51/13mm Low Pressure Cap 0.62/16mm High Pressure Cap A/C System Port Sealing Kit Universal for Most Cars (Black)**Ferianl**$6.10**3.7★47 rev](https://www.amazon.com/dp/B0FF9SX4MK) [3**Car A/C Valve Core Caps Leakproof Air Conditioning System Seal Kit R134a Air Conditioning Repair System Charging Port Caps High Low Side Pressure Replacement Valve Caps (2PCS)**KITUREK**$4.01**3.8★364 rev](https://www.amazon.com/dp/B0DDPJPRJN) [4**pinflaw 10 PCS R134a AC High & Low Pressure Port Caps AC Air Tool Dust Cap Car Air Conditioner Repair Parts Universal for Most Cars (Blue & Red)**pinflaw**$7.28**3.6★92 rev](https://www.amazon.com/dp/B0D9Q61X6T) [5**2PCS Car Air Conditioner Valve Caps Dustproof Car AC Caps with Built-in Gasket Include High and Low Pressure Cap Professional Vehicle Accessories AC Valve Cap for R134A System (2PCS)**Figpade**$4.04**4.0★88 rev](https://www.amazon.com/dp/B0F3JDJ5S2)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Brass A/C Valve Caps for R134a Systems 2 Pcs**EVETMSXI**$12.10**7 rev3mo ago](https://www.amazon.com/dp/B0GVQH4JZD) [**2PCS Car AC Low Pressure Port Cap & High Pressure Cap Brass Cars AC Valve Caps with Sealing Ring Seal-Tight & Dust-Proof ACS Service Port Caps Car Accessories for R134A System**Figpade**$9.55**14 rev3mo ago](https://www.amazon.com/dp/B0GT4H89NT) [**2pcs Car AC Valve Caps for R134a System Brass High & Low Pressure Service Port Caps Leak Proof Covers for Subaru & Most Japanese Vehicles (Not Compatible with American Vehicles)**Penitue**$9.64**22 rev7mo ago](https://www.amazon.com/dp/B0G5224DXB) [**Siptenk 100PCS Car AC Dust Caps R12 R134a High & Low Pressure Port Caps**Siptenk**$19.83**4 rev9mo ago](https://www.amazon.com/dp/B0FV7X297Y) [**YoRise Car A/C Valve Core Caps R134a Air Conditioning Repair System Charging Port Caps Leakproof Seal Kit AC System High & Low Pressure Valve Cap Replacement Accessories (4PCS)**YoRise**$3.49**6 rev9mo ago](https://www.amazon.com/dp/B0FV2GNV3K)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**2PCS Car AC Low Pressure Port Cap & High Pressure Cap Brass Cars AC Valve Caps with Sealing Ring Seal-Tight & Dust-Proof ACS Service Port Caps Car Accessories for R134A System**Figpade**$9.55**3.2★**▲ 112%**](https://www.amazon.com/dp/B0GT4H89NT) [**Brass A/C Valve Caps for R134a Systems 2 Pcs**EVETMSXI**$12.10**2.9★**▲ 112%**](https://www.amazon.com/dp/B0GVQH4JZD) [**YoRise Car A/C Valve Core Caps R134a Air Conditioning Repair System Charging Port Caps Leakproof Seal Kit AC System High & Low Pressure Valve Cap Replacement Accessories (4PCS)**YoRise**$3.49**3.0★**▲ 96%**](https://www.amazon.com/dp/B0FV2GNV3K) [**GAOLAOSY Car A/C Valve Core Cap AC System Charging Port Seal Caps Leakproof High & Low Side Pressure Valve Covers Kit Car R134a Air Conditioning Refrigerant Port Repair Accessories (2PCS)**GAOLAOSY**$3.67**3.9★**▲ 83%**](https://www.amazon.com/dp/B0FHB6654S) [**Siptenk 100PCS Car AC Dust Caps R12 R134a High & Low Pressure Port Caps**Siptenk**$19.83**5.0★**▲ 78%**](https://www.amazon.com/dp/B0FV7X297Y)
**~~View all trending →~~**
## **What buyers say about ac caps**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Size-Overall**43%
*“Fit perfect”*
**Quality-Overall**17%
*“The machining quality is impeccable”*
**Value For Money**10%
*“Good value”*
**Efficiency**8%
*“They do the job”*
**Advertised Vs Actual Product**6%
*“As advertised”*
**Material Quality**3%
*“Better than plastic”*
**Leak-Proof**3%
*“Prevent leaks”*
**Assembly/Installation**2%
*“Very easy to install”*
**Color**1%
*“multiple sizes and colors”*
**Durability**1%
*“Durability”*
### **What buyers complain about **
**Size-Overall**40%
*“Not for my car even though it was claimed to fit”*
**Compatibility-Overall**27%
*“does not fit A/C valves”*
**Quality-Overall**7%
*“Very cheap made”*
**Durability**3%
*“Will break”*
**Pressure**3%
*“The low pressure cap do not fit the valve”*
**Functionality-Overall**3%
*“Will mess up your car”*
**Leak-Proof**2%
*“dont hold up which allows the cap to leak”*
**Advertised Vs Actual Product**2%
*“Didnt Fit my Car as Advertised”*
**Weight Heavy**1%
*“They feel much heavier”*
**Socket/Port/Plug**1%
*“These are for ports with threads not the push type socket ports”*
### **Top return reasons **
**Size-Overall**56%
**Compatibility-Overall**27%
**Advertised Vs Actual Product**5%
**Defective Material/Parts**3%
**Functionality-Overall**2%
**Pressure**1%
**Value For Money**1%
**Charging**1%
**Socket/Port/Plug**1%
**Add-Ons/Attachments**1%
## **Common questions**
- **Is ac caps profitable to sell on Amazon United States?**
- The niche generates $37K/yr across 30 tracked products. 3 of 11 products launched in the last 360 days are still selling. 90-day search growth is +160.6%. Flapen's verdict: Worth a look (64/100).
- **How competitive is the ac caps niche?**
- 28 brands and 42 sellers compete. The top 5 products take 50% of clicks and top 5 brands hold 51% of demand.
- **What do buyers complain about in ac caps?**
- Top complaints mined from reviews: Size-Overall, Compatibility-Overall, Quality-Overall. The return rate is 2.4%.
- **When does demand for ac caps peak?**
- Demand peaks in Apr–May–Jun–Jul–Aug; the busiest month runs 10.8× the quietest.
- **What does it cost to enter the ac caps niche?**
- Listings span $3.49–$20.22; the average listing price is $8.26 (sweet spot $15–$100). The average incumbent carries 116 reviews — the moat a new listing must climb.
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