---
title: "3/8 Npt Plug — $46K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/automotive/3-8-npt-plug"
last_updated: "2026-08-09T15:03:39.195Z"
locale: en
meta:
description: "Niche score 47/100 · $46K/yr market · 34K searches/yr · $7.92 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 47/100 · $46K/yr market · 34K searches/yr · $7.92 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "3/8 Npt Plug — $46K/yr Amazon US Niche (2026) - Flapen"
---
# **3/8 npt plug**
**Skip it**
Prices mostly outside the sweet spot ($4.57–$13.36) — this niche doesn't clear our bar today.
Market size 12Growth 47Conversion 98Competition 57Returns 55Price range 0Avg price 22Brand share 67Review moat 92Quality gap 20
**Conversion**
**Incredible****17.4%**
search→purchase rate — share of searches ending in a sale
**Review moat**
**Great****153.04**
avg incumbent reviews — the moat a new listing must climb
**Brand share**
**Good****65%**
top-5 brand share — brands hold most of the demand
**Competition**
**Good****51%**
top-5 click share — leaders hold, buyers still browse
**Returns**
**Good****2.8%**
return rate — above 5% kills the launch gate
**Growth**
**Okay****+17.3%**
90-day search growth — must beat 0% to launch
**Avg price**
**Bad****$7.92**
avg listing price — sweet spot $15–$100
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Market size**
**Bad****$46K**
$46K/yr · 34K searches
**Price range**
**Bad****$4.57–$13.36**
cheapest to priciest tracked listing — scored on the share inside $15–$100
According to Flapen's Amazon United States niche tracking, 3/8 npt plug is a $46K/yr Amazon United States market (34K searches/yr). The top 5 brands hold 65% of demand. Verdict: Skip it — 47/100.
Data updated Jul 10, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **3/8 npt plug market data**
- **Units sold / yr**
- **5K–6K**
- avg 100–250/product
- **Revenue / yr**
- **$40K–$48K**
- units × avg price
- **Conversion rate**
- **17.4%**
- **Avg BSR**
- **#651**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **92%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **52 months**
- **Avg seller age**
- **187 days**
## **Competition & brand share**
The top 5 products take 51% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**17 **▼falling
**Sellers**
**20**
**Top-5 brand share**
**65%**
Top 20: 100%
**Top-5 click share**
**51%**
Top 20: 95%
**Open market**
**29%**
- Podavelle24% - EVIL ENERGY12% - LifCratms12% - Sliverdew10% - CX WONDERLAND7% - Hooshing6%
## **Demand**
Weekly Amazon search volume, last 13 weeks — +17.3% search growth over the last 90 days.
800600Apr '26Apr '26May '26May '26Jun '26Jun '26Jul '26
[**Open Trend **](https://flapen.com/research/us/automotive/3-8-npt-plug/trend)
## **Top 3/8 npt plug search terms**
- **3/8 npt plug**21K/yr+17.7%16.1% conv. - **3/8 plug**7K/yr+13.7%6.5% conv. - **3/8 pipe plug**5K/yr+20.3%15.3% conv. [**All search terms **](https://flapen.com/research/us/automotive/3-8-npt-plug/search-terms)
## **Top 3/8 npt plug 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%5%$2K10%$5K15%$7K20%$9K1101001K 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**Podavelle 3/8 NPT Male Thread Allen Head Socket Pipe Plug Fitting Aluminum Black Pack of 2**Podavelle**$9.92**4.7★364 rev](https://www.amazon.com/dp/B09L51BG4L) [2**LifCratms 3/8 NPT Male Plug 304 Stainless Steel Internal Hex Thread Pipe Plug Socket Kit (Pack of 5)**LifCratms**$7.23**4.5★58 rev](https://www.amazon.com/dp/B09QKR7B1J) [3**Brass 3/8 NPT Male Pipe Plug Fitting Set - 10 PCS Hex Counter Sunk Plugs for Pipe End Closure**Sliverdew**$8.14**4.7★294 rev](https://www.amazon.com/dp/B0CLXYZ5LT) [4**EVIL ENERGY 3/8 NPT Plug Male Hex Head Fitting Adapter Aluminum Black**EVIL ENERGY**$9.98**4.8★134 rev](https://www.amazon.com/dp/B0B7753QYX) [5**SUNGATOR 3/8 Inch NPT Plug Brass 3/8 Male Socket Pipe Plug Fittings 3/8 Male NPT Brass Outer Hex Thread Pipe Fittings 2 Pack**SUNGATOR**$5.54**4.3★52 rev](https://www.amazon.com/dp/B09ZKV2TDJ)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**10 Pcs 3/8 NPT Male Pipe Plug Set Brass Hex Counter Sunk Plugs for Closing the End of Pipe**Posocco**$5.36**5 rev6mo ago](https://www.amazon.com/dp/B0GCYZC4FM) [**5 PCS 3/8 NPT Male Pipe Plug Stainless Steel Pipe Plug Fitting Set Hex Counter Sunk Pipes Plugs for Closing the End of Pipes Internal Hex Socket Thread Socket Plugs Kit**Sliverdew**$6.05**5 rev8mo ago](https://www.amazon.com/dp/B0FZHD4VSM) [**2 Pack Brass Pipe Plug 3/8 NPT Male Outer Hex Head Socket Plug Fitting for Plumbing by CX WONDERLAND**CX WONDERLAND**$6.22**36 rev8mo ago](https://www.amazon.com/dp/B0FX524MFT) [**2pcs 3/8 NPT Male Brass Pipe Plug Counter Sunk Internal Hex Head by CX WONDERLAND**CX WONDERLAND**$4.57**14 rev1y ago](https://www.amazon.com/dp/B0FCMNFSP9) [**3/8 NPT Pipe Plug Vibra-Seal Coating | 3/8 X .375 NPT Threaded | Leak-Proof Seal | Durable Performance (10)**EngineQuest**$13.36**5 rev1y ago](https://www.amazon.com/dp/B0F15BZJDF)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**10 Pcs 3/8 NPT Male Pipe Plug Set Brass Hex Counter Sunk Plugs for Closing the End of Pipe**Posocco**$5.36**5.0★**▲ 224%**](https://www.amazon.com/dp/B0GCYZC4FM) [**2 Pack Brass Pipe Plug 3/8 NPT Male Outer Hex Head Socket Plug Fitting for Plumbing by CX WONDERLAND**CX WONDERLAND**$6.22**4.7★**▲ 131%**](https://www.amazon.com/dp/B0FX524MFT) [**5 PCS 3/8 NPT Male Pipe Plug Stainless Steel Pipe Plug Fitting Set Hex Counter Sunk Pipes Plugs for Closing the End of Pipes Internal Hex Socket Thread Socket Plugs Kit**Sliverdew**$6.05**5.0★**▲ 126%**](https://www.amazon.com/dp/B0FZHD4VSM) [**Podavelle 3/8 NPT Male Thread Allen Head Socket Pipe Plug Fitting Aluminum Silver Pack of 2**Podavelle**$9.96**4.7★**▲ 80%**](https://www.amazon.com/dp/B0CZXQL2CX) [**2pcs 3/8 NPT Male Brass Pipe Plug Counter Sunk Internal Hex Head by CX WONDERLAND**CX WONDERLAND**$4.57**4.7★**▲ 54%**](https://www.amazon.com/dp/B0FCMNFSP9)
**~~View all trending →~~**
## **What buyers say about 3/8 npt plug**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Size-Overall**25%
*“A perfect fit”*
**Quality-Overall**20%
*“Good product”*
**Advertised Vs Actual Product**20%
*“Works as expected”*
**Socket/Port/Plug**15%
*“Great plugs”*
**Leak-Proof**10%
*“However it remains leak free so far”*
### **What buyers complain about **
**Size-Overall**50%
*“Da no fit”*
**Leak-Proof**20%
*“I don't think Teflon tape would have provided a leak free fitting”*
**Design-Overall**20%
*“Poorly machined”*
### **Top return reasons **
**Size-Overall**86%
**Advertised Vs Actual Product**5%
**Compatibility-Overall**3%
**Socket/Port/Plug**3%
**Functionality-Overall**2%
**Defective Material/Parts**1%
**Color**0%
**Certifications**0%
**Width**0%
**Leak-Proof**0%
## **Common questions**
- **Is 3/8 npt plug profitable to sell on Amazon United States?**
- The niche generates $46K/yr across 24 tracked products. 0 of 3 products launched in the last 360 days are still selling. 90-day search growth is +17.3%. Flapen's verdict: Skip it (47/100).
- **How competitive is the 3/8 npt plug niche?**
- 17 brands and 20 sellers compete. The top 5 products take 51% of clicks and top 5 brands hold 65% of demand.
- **What do buyers complain about in 3/8 npt plug?**
- Top complaints mined from reviews: Size-Overall, Leak-Proof, Design-Overall. The return rate is 2.8%.
- **What does it cost to enter the 3/8 npt plug niche?**
- Listings span $4.57–$13.36; the average listing price is $7.92 (sweet spot $15–$100). The average incumbent carries 153 reviews — the moat a new listing must climb.
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