---
title: "6an to 3/8 Barb — $56K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/automotive/6an-to-3-8-barb"
last_updated: "2026-08-09T11:34:18.822Z"
locale: en
meta:
description: "Niche score 42/100 · $56K/yr market · 27K searches/yr · $13.11 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 42/100 · $56K/yr market · 27K searches/yr · $13.11 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "6an to 3/8 Barb — $56K/yr Amazon US Niche (2026) - Flapen"
---
# **6an to 3/8 barb**
**Skip it**
Brand-locked demand (top 5 brands take 95% of clicks) — this niche doesn't clear our bar today.
Market size 14Growth 52Conversion 97Competition 25Returns 60Price range 45Avg price 59Brand share 12Review moat 81Quality gap 18
**Conversion**
**Incredible****15.6%**
search→purchase rate — share of searches ending in a sale
**Review moat**
**Great****384.59**
avg incumbent reviews — the moat a new listing must climb
**Returns**
**Good****2.6%**
return rate — above 5% kills the launch gate
**Avg price**
**Good****$13.11**
avg listing price — sweet spot $15–$100
**Growth**
**Good****+23.0%**
90-day search growth — must beat 0% to launch
**Price range**
**Okay****$7.92–$20.71**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Competition**
**Bad****71%**
top-5 click share — a locked-up shelf
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Market size**
**Bad****$56K**
$56K/yr · 27K searches
**Brand share**
**Bad****95%**
top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, 6an to 3/8 barb is a $56K/yr Amazon United States market (27K searches/yr). The top 5 brands hold 95% of demand. Verdict: Skip it — 42/100.
Data updated Jul 10, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **6an to 3/8 barb market data**
- **Units sold / yr**
- **4K–5K**
- avg 100–250/product
- **Revenue / yr**
- **$52K–$66K**
- units × avg price
- **Conversion rate**
- **15.6%**
- **Avg BSR**
- **#189**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **88%**
- **Out of stock**
- **2.6%**
- **Avg brand age**
- **35 months**
- **Avg seller age**
- **240 days**
## **Competition & brand share**
The top 5 products capture 71% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**7 **▼falling
**Sellers**
**11**
**Top-5 brand share**
**95%**
Top 20: 100%
**Top-5 click share**
**71%**
Top 20: 100%
**Open market**
**2%**
- EVIL ENERGY50% - Podavelle28% - Ucreative8% - TRUCKMETER7% - CNRAQR3% - VVORHSBELL3% - Open — no brand owns it (1 brand, 2%)
## **Demand**
Weekly Amazon search volume, last 11 weeks — +23.0% search growth over the last 90 days.
600400Apr '26May '26May '26May '26May '26May '26Jun '26Jun '26Jun '26Jun '26Jul '26
[**Open Trend **](https://flapen.com/research/us/automotive/6an-to-3-8-barb/trend)
## **Top 6an to 3/8 barb search terms**
- **6an to 3/8 barb**16K/yr+17.7%13.0% conv. - **6an female to 3/8 barb**4K/yr+28.6%12.6% conv. - **an6 to 3/8 barb**2K/yr+30.1%11.8% conv. - **6 an to 3/8 barb**2K/yr+41.9%14.9% conv. - **6an to barb**2K/yr+20.7%8.4% conv. [**All search terms **](https://flapen.com/research/us/automotive/6an-to-3-8-barb/search-terms)
## **Top 6an to 3/8 barb 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%$6K20%$11K30%$17K40%$22K101001K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 17 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**EVIL ENERGY 6AN Female to 3/8 Barb Hose Fitting Straight Swivel**EVIL ENERGY**$10.76**4.8★673 rev](https://www.amazon.com/dp/B09493DPL4) [2**Podavelle 6AN Male Flare to 3/8 Hose Barb Straight Fitting Adapter Aluminum Black 2PCS**Podavelle**$10.98**4.8★450 rev](https://www.amazon.com/dp/B0D4QTHZHY) [3**EVIL ENERGY 6AN Female to 3/8 Barb Hose Fitting Straight Swivel 2PCS**EVIL ENERGY**$17.52**4.7★325 rev](https://www.amazon.com/dp/B0BQ6SCMTL) [4**Ucreative 6AN Straight Push Lock Hose Fitting End Black 2PCS**Ucreative**$7.92**4.8★529 rev](https://www.amazon.com/dp/B0BZKL2RZN) [5**Podavelle 6AN Female to 3/8 Barb Hose Fitting Adapter Straight Swivel Aluminum Black**Podavelle**$10.72**4.8★504 rev](https://www.amazon.com/dp/B09XDQWH64)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**EVIL ENERGY 6AN Female to 3/8 Hose Barb Fitting Adapter**EVIL ENERGY**$9.99**22 rev1y ago](https://www.amazon.com/dp/B0DKFD8QH1) [**TRUCKMETER 6AN Female to 3/8 Hose Barb Fittings Adapter Black Hard Aluminum Hex Anodized Push On Barb Connector Automotive Accessories Suitable for Vehicle Fuel Oil Line Modification**TRUCKMETER**$11.37**14 rev1y ago](https://www.amazon.com/dp/B0DLK7V4X1) [**2Pcs Straight 6AN Female to 3/8 Push Lock Hose Fitting End for Rubber Fuel Line Black Hard Two Stage Barb Aluminum Anodized Connector Automotive Accessories for Vehicle Fuel Oil Line Modification**TRUCKMETER**$10.67**135 rev1y ago](https://www.amazon.com/dp/B0DC696Z6B) [**Podavelle 6AN Male Flare to 3/8 Hose Barb Straight Fitting Adapter Aluminum Black 2PCS**Podavelle**$10.98**450 rev2y ago](https://www.amazon.com/dp/B0D4QTHZHY) [**Podavelle 6AN Female to 3/8 Barb Hose Fitting Adapter Straight Swivel Aluminum Black 2PCS**Podavelle**$17.48**504 rev2y ago](https://www.amazon.com/dp/B0D4QR8S21)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**VVORHSBELL 6AN to 3/8 Barb Straight Push Lock Hose Fitting End For Rubber Fuel Line Black 2PCS**VVORHSBELL**$11.15**4.7★**▲ 118%**](https://www.amazon.com/dp/B0CLD7MY6D) [**EVIL ENERGY 6AN Female to 3/8 Barb Hose Fitting 90 Degree Swivel**EVIL ENERGY**$15.57**4.8★**▲ 62%**](https://www.amazon.com/dp/B09VPMSH2N) [**EVIL ENERGY 6AN Male to 3/8 Barb Push on Fitting Adapter Aluminum 2PCS**EVIL ENERGY**$14.74**4.7★**▲ 43%**](https://www.amazon.com/dp/B0D1QQ17RN) [**Podavelle 6AN Female to 3/8 Barb Hose Fitting Adapter Straight Swivel Aluminum Black**Podavelle**$10.72**4.8★**▲ 26%**](https://www.amazon.com/dp/B09XDQWH64) [**CNRAQR 6AN Female to 3/8 Barb Straight Swivel Fitting Adapter Aluminum Black 4Pcs**CNRAQR**$16.71**4.8★**▲ 21%**](https://www.amazon.com/dp/B0B9WJL48D)
**~~View all trending →~~**
## **What buyers say about 6an to 3/8 barb**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**42%
*“Nice item, just as described”*
**Size-Overall**31%
*“Perfect fit”*
**Advertised Vs Actual Product**11%
*“As described”*
**Value For Money**6%
*“Good for the price”*
**Leak-Proof**4%
*“No leaks”*
**Ease Of Cleaning**4%
*“Clean”*
**Design-Overall**4%
*“Great quality and clean design”*
### **What buyers complain about **
**Metal Quality**60%
*“Just remember to use the appropriate tools because these are soft metal”*
**Material Quality**20%
*“Feels plasticky - I guess it's aluminum”*
**Product Condition**20%
*“Product was used”*
### **Top return reasons **
**Size-Overall**68%
**Advertised Vs Actual Product**6%
**Compatibility-Overall**6%
**Defective Material/Parts**5%
**Value For Money**4%
**Functionality-Overall**3%
**Assembly/Installation**2%
**Quality-Overall**1%
**Design-Overall**1%
**Leak-Proof**1%
## **Common questions**
- **Is 6an to 3/8 barb profitable to sell on Amazon United States?**
- The niche generates $56K/yr across 17 tracked products. 90-day search growth is +23.0%. Flapen's verdict: Skip it (42/100).
- **How competitive is the 6an to 3/8 barb niche?**
- 7 brands and 11 sellers compete. The top 5 products take 71% of clicks and top 5 brands hold 95% of demand.
- **What do buyers complain about in 6an to 3/8 barb?**
- Top complaints mined from reviews: Metal Quality, Material Quality, Product Condition. The return rate is 2.6%.
- **What does it cost to enter the 6an to 3/8 barb niche?**
- Listings span $7.92–$20.71; the average listing price is $13.11 (sweet spot $15–$100). The average incumbent carries 385 reviews — the moat a new listing must climb.
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