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.

3/8 npt plug

Skip it

Prices mostly outside the sweet spot ($4.57–$13.36) — this niche doesn't clear our bar today.

Conversion

Incredible17.4%

search→purchase rate — share of searches ending in a sale

Review moat

Great153.04

avg incumbent reviews — the moat a new listing must climb

Brand share

Good65%

top-5 brand share — brands hold most of the demand

Competition

Good51%

top-5 click share — leaders hold, buyers still browse

Returns

Good2.8%

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

Bad4.7★

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

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

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.

Open Trend

Top 3/8 npt plug search terms

3/8 npt plug21K/yr +17.7%16.1% conv.
3/8 plug7K/yr +13.7%6.5% conv.
3/8 pipe plug5K/yr +20.3%15.3% conv.

All 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.

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

Podavelle 3/8 NPT Male Thread Allen Head Socket Pipe Plug Fitting Aluminum Black Pack of 2

Podavelle$9.924.7★364 rev

LifCratms 3/8 NPT Male Plug 304 Stainless Steel Internal Hex Thread Pipe Plug Socket Kit (Pack of 5)

LifCratms$7.234.5★58 rev

Brass 3/8 NPT Male Pipe Plug Fitting Set - 10 PCS Hex Counter Sunk Plugs for Pipe End Closure

Sliverdew$8.144.7★294 rev

EVIL ENERGY 3/8 NPT Plug Male Hex Head Fitting Adapter Aluminum Black

EVIL ENERGY$9.984.8★134 rev

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$5.544.3★52 rev

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$5.365 rev

6mo ago

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$6.055 rev

8mo ago

2 Pack Brass Pipe Plug 3/8 NPT Male Outer Hex Head Socket Plug Fitting for Plumbing by CX WONDERLAND

CX WONDERLAND$6.2236 rev

8mo ago

2pcs 3/8 NPT Male Brass Pipe Plug Counter Sunk Internal Hex Head by CX WONDERLAND

CX WONDERLAND$4.5714 rev

1y ago

3/8 NPT Pipe Plug Vibra-Seal Coating | 3/8 X .375 NPT Threaded | Leak-Proof Seal | Durable Performance (10)

EngineQuest$13.365 rev

1y ago

What buyers say about 3/8 npt plug

What buyers praise and complain about, mined from review topics.

What buyers love

Size-Overall25%

“A perfect fit”

Quality-Overall20%

“Good product”

Advertised Vs Actual Product20%

“Works as expected”

Socket/Port/Plug15%

“Great plugs”

Leak-Proof10%

“However it remains leak free so far”

What buyers complain about

Size-Overall50%

“Da no fit”

Leak-Proof20%

“I don't think Teflon tape would have provided a leak free fitting”

Design-Overall20%

“Poorly machined”

Top return reasons

Size-Overall86%

Advertised Vs Actual Product5%

Compatibility-Overall3%

Socket/Port/Plug3%

Functionality-Overall2%

Defective Material/Parts1%

Color0%

Certifications0%

Width0%

Leak-Proof0%

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.