Is washer fluid cap profitable to sell on Amazon United States?

The niche generates $83K/yr across 32 tracked products. 0 of 6 products launched in the last 360 days are still selling. 90-day search growth is -21.7%. Flapen's verdict: Worth a look (50/100).

How competitive is the washer fluid cap niche?

25 brands and 50 sellers compete. The top 5 products take 54% of clicks and top 5 brands hold 57% of demand.

What do buyers complain about in washer fluid cap?

Top complaints mined from reviews: Size-Overall, Compatibility-Overall, Quality-Overall. The return rate is 2.5%.

When does demand for washer fluid cap peak?

Demand is steady year-round — the busiest month runs 1.3× the quietest.

What does it cost to enter the washer fluid cap niche?

Listings span $3.87–$8.22; the average listing price is $4.97 (sweet spot $15–$100). The average incumbent carries 442 reviews — the moat a new listing must climb.

washer fluid cap

Worth a look

Shows beatable incumbent ratings (4.0★), but prices mostly outside the sweet spot ($3.87–$8.22) keeps it on the watch list.

Quality gap

Incredible4.0★

avg incumbent rating — lower means beatable quality

Conversion

Great10.1%

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

Brand share

Great57%

top-5 brand share — no brand owns this niche

Review moat

Great442.38

avg incumbent reviews — the moat a new listing must climb

Returns

Good2.5%

return rate — above 5% kills the launch gate

Competition

Good54%

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

Market size

Bad$83K

$83K/yr · 165K searches

Growth

Bad-21.7%

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

Avg price

Bad$4.97

avg listing price — sweet spot $15–$100

Price range

Bad$3.87–$8.22

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

Signals No Dominant Brand

According to Flapen's Amazon United States niche tracking, washer fluid cap is a $83K/yr Amazon United States market (165K searches/yr). The top 5 brands hold 57% of demand. Verdict: Worth a look — 50/100.

Data updated Jul 9, 2026 · scored weekly · How we score niches

washer fluid cap market data

Units sold / yr: 15K–20K; avg 250–500/product
Revenue / yr: $75K–$99K; units × avg price
Conversion rate: 10.1%
Avg BSR: #647
Page quality: 0%
Prime: 100%
Sponsored: 59%
Out of stock: 0.0%
Avg brand age: 31 months
Avg seller age: 165 days

Competition & brand share

The top 5 products take 54% of clicks — established leaders, but buyers still shop beyond them.

Brands

25 rising

Sellers

Top-5 brand share

57%

Top 20: 95%

Top-5 click share

54%

Top 20: 87%

Open market

38%

KEVWR19%
Nudhfgauiyt11%
OTUAYAUTO11%
Toeeklsa10%
GM GENUINE PARTS6%
Tecledsn5%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -21.7% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.3×

Open Trend

Top washer fluid cap search terms

washer fluid cap36K/yr -26.6%8.0% conv.
windshield washer fluid cap20K/yr -9.8%7.1% conv.
windshield washer reservoir cap18K/yr -25.3%6.8% conv.
windshield wiper fluid cap12K/yr -17.5%8.6% conv.
windshield fluid cap9K/yr -14.7%8.2% conv.
washer fluid reservoir cap8K/yr -19.2%7.6% conv.
windshield washer cap9K/yr -31.1%7.5% conv.
windshield washer cap replacement5K/yr -13.6%6.9% conv.
wiper fluid cap7K/yr -37.6%8.9% conv.
washer fluid cap replacement6K/yr -11.1%10.2% conv.

All search terms

Top washer fluid cap 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

Car Wiper Bottle Cover Windshield Wiper Washer Fluid Reservoir Tank Bottle Cap Car Wiper Bottle Cover Replacement Cap Compatible with GMC Chevrolet Buick Cadillac OEM: 12767700 13227300

KEVWR$5.094.5★1,265 rev

Windshield Wiper Washer Fluid Reservoir Tank Bottle Cap Cover For ChevroletFor Buick For Cadillac For GMCFor Chevrolet part of the model

Nudhfgauiyt$5.164.6★1,476 rev

OTUAYAUTO Windshield Wiper Washer Fluid Reservoir Tank Bottle Cap - for Chevrolet Buick GMC Cadillac - OEM#: 12767700 13227300 12788573 19172571

OTUAYAUTO$5.264.1★1,726 rev

Washer Fluid Cap Windshield Wiper Washer Fluid Reservoir Tank Bottle Cap Replacement for GMC Chevrolet Cadillac Buick - OEM#: 12767700 13227300

Toeeklsa$4.954.1★571 rev

GM Genuine Parts 13227300 Windshield Washer Fluid Reservoir Cap

GM GENUINE PARTS$8.224.8★645 rev

Newest

by launch date

WZP Windshield Washer Fluid Cap Car Wiper Bottle Cover Replacement for 12767700 13227300 Windshield Wiper Washer Fluid Reservoir Tank Bottle Cap Compatible with GMC Chevy Buick Cadillac

WZP$4.9011 rev

5mo ago

ESWW Windshield Washer Fluid Cap Windshield Wiper Fluid Reservoir Cap for VW Atlas Tiguan Jetta GTI Durable Leak-Proof Tank Bottle Lid Automotive Accessories Replacement #3Q0955455 (1PCS)

ESWW$5.0119 rev

6mo ago

SWQS Windshield Washer Fluid Reservoir Cap Replacement Car Wiper Bottle Cover for GMC Chevry Buick Cadillac Acadia Cruze Malibu Trax LaCrosse CTS ATS XTS OEM 13227300 12767700 19172571 12788573

SWQS$4.1351 rev

9mo ago

Biabari 2PCS Windshield Washer Fluid Reservoir Cap Leak-Proof Windshield Wiper Fluid Cap OE# 13227300 19172571 12767700 12788573 Fits GMC/Chevy Silverado/Cadillac ATS/Buick

Biabari$4.38159 rev

10mo ago

TNAIYH Car Washer Fluid Cap OEM#3Q0955455 Vehicle Windshield Wiper Reservoir Water Tank Bottle Cap Cover Automotive Replacement Accessories Compatible with Atlas Tiguan Jetta

TNAIYH$4.7931 rev

10mo ago

What buyers say about washer fluid cap

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

What buyers love

Size-Overall61%

“Fit as it should”

Advertised Vs Actual Product9%

“Just as advertised”

Quality-Overall7%

“Great quality and easy to install”

Value For Money5%

“at a reasonable price”

Assembly/Installation5%

“it works fine once installed”

Efficiency2%

“works as it should”

Durability2%

“just not broken”

Ease Of Use1%

“super easy to put on”

Wet Cleaning1%

“Washer Fluid Cap works like it should”

Strength1%

“seems sturdy”

What buyers complain about

Size-Overall43%

“its too big”

Compatibility-Overall20%

“Not Compatible”

Quality-Overall7%

“Quality not very good”

Advertised Vs Actual Product7%

“False advertisement”

Functionality-Overall3%

“Didn't work”

Defective Material/Parts2%

“Faulty product”

Strength2%

“Very brittle”

Durability2%

“seems it may break off eventually”

Material Quality2%

“Not made with appropriate material”

Ease Of Use2%

“Cant open”

Top return reasons

Size-Overall77%

Compatibility-Overall13%

Advertised Vs Actual Product4%

Defective Material/Parts2%

Windshield Issues1%

Functionality-Overall1%

Value For Money0%

Assembly/Installation0%

Mechanism Issues0%

Shape/Style0%

Common questions

Is washer fluid cap profitable to sell on Amazon United States?: The niche generates $83K/yr across 32 tracked products. 0 of 6 products launched in the last 360 days are still selling. 90-day search growth is -21.7%. Flapen's verdict: Worth a look (50/100).
How competitive is the washer fluid cap niche?: 25 brands and 50 sellers compete. The top 5 products take 54% of clicks and top 5 brands hold 57% of demand.
What do buyers complain about in washer fluid cap?: Top complaints mined from reviews: Size-Overall, Compatibility-Overall, Quality-Overall. The return rate is 2.5%.
When does demand for washer fluid cap peak?: Demand is steady year-round — the busiest month runs 1.3× the quietest.
What does it cost to enter the washer fluid cap niche?: Listings span $3.87–$8.22; the average listing price is $4.97 (sweet spot $15–$100). The average incumbent carries 442 reviews — the moat a new listing must climb.