Is 1/4 turn angle valve 1/2 inlet 3/8 outlet profitable to sell on Amazon United States?

The niche generates $81K/yr across 62 tracked products. 3 of 9 products launched in the last 360 days are still selling. 90-day search growth is -18.1%. Flapen's verdict: Worth a look (55/100).

How competitive is the 1/4 turn angle valve 1/2 inlet 3/8 outlet niche?

32 brands and 114 sellers compete. The top 5 products take 32% of clicks and top 5 brands hold 50% of demand.

What do buyers complain about in 1/4 turn angle valve 1/2 inlet 3/8 outlet?

Top complaints mined from reviews: Leak-Proof, Quality-Overall, Noise Level. The return rate is 2.8%.

What does it cost to enter the 1/4 turn angle valve 1/2 inlet 3/8 outlet niche?

Listings span $6.43–$75.67; the average listing price is $21.45 (sweet spot $15–$100). The average incumbent carries 593 reviews — the moat a new listing must climb.

1/4 turn angle valve 1/2 inlet 3/8 outlet

Worth a look

Shows a sweet-spot price point ($21.45 avg), but soft demand (-18.1% this quarter) keeps it on the watch list.

Avg price

Great$21.45

avg listing price — sweet spot $15–$100

Brand share

Great50%

top-5 brand share — no brand owns this niche

Price range

Great$6.43–$75.67

cheapest to priciest tracked listing — scored on the share inside $15–$100

Competition

Great32%

top-5 click share — an open shelf

Conversion

Great7.8%

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

Review moat

Good593.29

avg incumbent reviews — the moat a new listing must climb

Returns

Good2.8%

return rate — above 5% kills the launch gate

Quality gap

Bad4.6★

avg incumbent rating — lower means beatable quality

Market size

Bad$81K

$81K/yr · 48K searches

Growth

Bad-18.1%

90-day search growth — must beat 0% to launch

Signals No Dominant Brand

According to Flapen's Amazon United States niche tracking, 1/4 turn angle valve 1/2 inlet 3/8 outlet is a $81K/yr Amazon United States market (48K searches/yr). The top 5 brands hold 50% of demand. Verdict: Worth a look — 55/100.

Data updated Jul 29, 2026 · scored weekly · How we score niches

1/4 turn angle valve 1/2 inlet 3/8 outlet market data

Units sold / yr: 3K–4K; avg 0–100/product
Revenue / yr: $64K–$86K; units × avg price
Conversion rate: 7.8%
Avg BSR: #595
Page quality: 0%
Prime: 100%
Sponsored: 81%
Out of stock: 1.7%
Avg brand age: 49 months
Avg seller age: 161 days

Competition & brand share

Clicks spread well past the top 5 (32% combined) — an open shelf where new products get seen.

Brands

32 flat

Sellers

114

Top-5 brand share

50%

Top 20: 91%

Top-5 click share

32%

Top 20: 67%

Open market

44%

GUOFIS13%
Eastman12%
EFIELD10%
PXZBLG9%
TT FLEX6%
PROCURU6%

Demand

Weekly Amazon search volume, last 48 weeks — -18.1% search growth over the last 90 days.

Open Trend

Top 1/4 turn angle valve 1/2 inlet 3/8 outlet search terms

angle stops5K/yr +7.9%7.2% conv.
toilet water shut off valve5K/yr -17.8%6.2% conv.
1/2 x 3/8 compression shut off valve 1/4 turn3K/yr -8.3%6.3% conv.
1/2 valve shut off4K/yr +9.3%2.7% conv.
toilet shutoff valve5K/yr -9.5%5.0% conv.
1/2 inch shut off valve4K/yr +10.1%2.4% conv.
toilet supply valve4K/yr -12.6%6.0% conv.
1/2 shut off valve water line3K/yr -11.8%2.8% conv.
1/2 angle stop valve3K/yr -29.2%4.4% conv.
1/4 turn angle valve 1/2 inlet 3/8 outlet5K/yr -54.1%6.2% conv.

All search terms

Top 1/4 turn angle valve 1/2 inlet 3/8 outlet 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

Eastman Multi-Turn Angle Stop Valve with Nut and Sleeve 3/8 Inch OD x 5/8 Inch OD Chrome Plate 48290LF

Eastman$7.344.7★426 rev

10 Pack GUOFIS Angle Compression Stop Valve 1/4 Turn Water Shut Off Valve

GUOFIS$38.194.8★276 rev

[10-Pack] PROCURU Heavy Duty Angle Stop Valve 1/2 Nominal (5/8 OD) Compression x 3/8 OD 1/4-Turn Operation (PCAS12-10P)

PROCURU$44.514.6★315 rev

10PCS EFIELD Angle Stop Valve 1/2 Nominal (5/8 OD) Compression x 3/8 OD

EFIELD$38.494.8★460 rev

Toilet Connector Water Line Kit with 12 Length Long 3/8 COMP x 7/8 BC Toilet Connector Hose 1/2 inch NOM Inlet x 3/8 inch OD Compression Outlet Angle Shut Off and Escutcheon Plate

TT FLEX$13.934.6★325 rev

Newest

by launch date

PevePexe Toilet Hose Water Supply Line Kit - 15 Length 3/8 COMP x 7/8 BC Braided Toilet Connector Hose & Shut Off Toilet Water 1/2 inch NOM Inlet x 3/8 inch OD Compression Outlet Angle

PEVEPEXE$15.948 rev

6mo ago

1 Pack Angle Stop Valve 1/4 Turn Water Shut Off Valves 1/2 Nominal (5/8 OD) Compression Inlet x 3/8 OD Compression Outlet Shut-off Valve for Sink Bathroom Toilet Kitchen Laundry Plumbing

oiununo$8.1831 rev

8mo ago

2 Pack 1/2 Mini Ball Valve 304 Stainless Steel Valve NPT Female x Male Thread Shut-Off Valves for Small Compact Space (2 1/2 Inch)

SKLSSVF$14.63119 rev

11mo ago

2 Pack Toilet Valve Replacement Kit with Water Supply Line Shut Off Valve

Dreyoo$21.20112 rev

1y ago

1 Pack Toilet Valve Replacement Kit with Water Supply Line Shut Off Valve

Dreyoo$14.39112 rev

1y ago

What buyers say about 1/4 turn angle valve 1/2 inlet 3/8 outlet

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

What buyers love

Assembly/Installation23%

“Easy fix”

Quality-Overall15%

“Quality is fair”

Value For Money9%

“Great Value”

Advertised Vs Actual Product7%

“As advertised”

Efficiency6%

“Perfect Solution”

Ease Of Use6%

“Easy as pie”

Leak-Proof5%

“DOES NOT leak”

Size-Overall5%

“Easy fit”

Instructions/User Manual/Troubleshooting3%

“Instructions are clear”

Pressure3%

“This can adjust the water pressure to exactly your liking”

What buyers complain about

Leak-Proof23%

“They leak”

Quality-Overall12%

“Garbage”

Noise Level10%

“Random noises”

Durability7%

“broke almost instantly”

Functionality-Overall3%

“Has never worked properly”

Product Condition3%

“Used. Arrived used. Was cleaned”

Value For Money2%

“Not worth the extra money”

Water Resistance2%

“Doesnt stop water”

Size-Overall2%

“Small”

Design-Overall2%

“Good product bad nut design”

Top return reasons

Size-Overall43%

Leak-Proof11%

Defective Material/Parts7%

Compatibility-Overall7%

Advertised Vs Actual Product6%

Functionality-Overall6%

Value For Money5%

Quality-Overall2%

Connectivity-Overall2%

Product Condition2%

Common questions

Is 1/4 turn angle valve 1/2 inlet 3/8 outlet profitable to sell on Amazon United States?: The niche generates $81K/yr across 62 tracked products. 3 of 9 products launched in the last 360 days are still selling. 90-day search growth is -18.1%. Flapen's verdict: Worth a look (55/100).
How competitive is the 1/4 turn angle valve 1/2 inlet 3/8 outlet niche?: 32 brands and 114 sellers compete. The top 5 products take 32% of clicks and top 5 brands hold 50% of demand.
What do buyers complain about in 1/4 turn angle valve 1/2 inlet 3/8 outlet?: Top complaints mined from reviews: Leak-Proof, Quality-Overall, Noise Level. The return rate is 2.8%.
What does it cost to enter the 1/4 turn angle valve 1/2 inlet 3/8 outlet niche?: Listings span $6.43–$75.67; the average listing price is $21.45 (sweet spot $15–$100). The average incumbent carries 593 reviews — the moat a new listing must climb.