Is kohler aqua piston yellow cap profitable to sell on Amazon United States?

The niche generates $99K/yr across 16 tracked products. 1 of 6 products launched in the last 360 days are still selling. 90-day search growth is +1.9%. Flapen's verdict: Skip it (37/100).

How competitive is the kohler aqua piston yellow cap niche?

9 brands and 65 sellers compete. The top 5 products take 77% of clicks and top 5 brands hold 93% of demand.

What do buyers complain about in kohler aqua piston yellow cap?

Top complaints mined from reviews: Leak-Proof, Product Condition, Instructions/User Manual/Troubleshooting. The return rate is 4.8%.

What does it cost to enter the kohler aqua piston yellow cap niche?

Listings span $6.74–$29.80; the average listing price is $15.48 (sweet spot $15–$100). The average incumbent carries 1,277 reviews — the moat a new listing must climb.

kohler aqua piston yellow cap

Skip it

Brand-locked demand (top 5 brands take 93% of clicks) — this niche doesn't clear our bar today.

Conversion

Incredible15.3%

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

Avg price

Great$15.48

avg listing price — sweet spot $15–$100

Price range

Good$6.74–$29.80

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

Review moat

Good1,277.38

avg incumbent reviews — the moat a new listing must climb

Returns

Okay4.8%

return rate — above 5% kills the launch gate

Growth

Okay+1.9%

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

Market size

Bad$99K

$99K/yr · 42K searches

Competition

Bad77%

top-5 click share — a locked-up shelf

Brand share

Bad93%

top-5 brand share — brand-locked demand

Quality gap

Bad4.7★

avg incumbent rating — lower means beatable quality

According to Flapen's Amazon United States niche tracking, kohler aqua piston yellow cap is a $99K/yr Amazon United States market (42K searches/yr). The top 5 brands hold 93% of demand. Verdict: Skip it — 37/100.

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

kohler aqua piston yellow cap market data

Units sold / yr: 5K–6K; avg 250–500/product
Revenue / yr: $77K–$93K; units × avg price
Conversion rate: 15.3%
Avg BSR: #2,837
Page quality: 0%
Prime: 100%
Sponsored: 94%
Out of stock: 5.1%
Avg brand age: 27 months
Avg seller age: 164 days

Competition & brand share

The top 5 products capture 77% of clicks — a locked-up shelf that new listings rarely crack.

Brands

9 rising

Sellers

Top-5 brand share

93%

Top 20: 100%

Top-5 click share

77%

Top 20: 100%

Open market

Kohler70%
Hebewater11%
SOOLINEY8%
Javiix2%
ZephyrJazz2%
LAZX Intl2%
Open — no brand owns it (3 brands, 5%)

Demand

Weekly Amazon search volume, last 39 weeks — +1.9% search growth over the last 90 days.

Open Trend

Top kohler aqua piston yellow cap search terms

aqua piston repair kit6K/yr +1.1%14.7% conv.
kohler aqua piston yellow cap6K/yr +14.1%12.9% conv.
kohler aqua piston3K/yr +36.3%9.6% conv.
gp12296564K/yr +0.6%18.5% conv.
kohler aqua piston repair kit5K/yr -21.5%15.3% conv.
kohler 11105864K/yr -2.7%5.3% conv.
aquapiston3K/yr +12.1%16.5% conv.
kohler gp12296563K/yr +0.8%19.9% conv.
aqua piston4K/yr +0.1%10.6% conv.
aquapiston repair kit for flush valve3K/yr -11.6%13.7% conv.

All search terms

Top kohler aqua piston yellow 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 16 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

KOHLER GENUINE PART 1188998 2 Toilet Canister Flush Valve Kit

Kohler$17.574.7★1,435 rev

KOHLER GENUINE PART GP1229656 Canister Repair Kit For single flush canister toilets Includes cap center guide and chain

Kohler$11.644.8★2,181 rev

Hebewater Canister Flush Valve Replacement Kit Compatible with Kohler GP1229656 K-1188999 K-1188998 for AquaPiston System Includes Center Guide Cap and Chain Toilet Tank Repair Kit.

Hebewater$8.144.6★67 rev

Toilet Canister Flush Valve Replacement Kit Compatible With Kohler GP1229656 K-1188999 K-1188998 For AquaPiston System Includes Center Guide Cap and Chain WC Tank Repair Kit

SOOLINEY$8.095.0★3 rev

KOHLER 1117210 Flush Valve Kit 1.28

Kohler$26.634.6★1,514 rev

Newest

by launch date

GP1229656 Canister Flush Valve Repair Kit Compatible with Kohler K-1188999 K-1188998 Single Flush Toilets (Includes Cap Center Guide Chain & Seals) for AquaPiston Systems

LAZX Intl$12.869 rev

5mo ago

Toilet Canister Repair Kit compatible with Kohler GP1229656/ K-1188999/K-1188998 For AquaPiston single flush system Parts Includes Center Guide Chain and Cap1 set

DKEWIAY$7.838 rev

7mo ago

Toilet Canister Flush Valve Replacement Kit Compatible With Kohler GP1229656 K-1188999 K-1188998 For AquaPiston System Includes Center Guide Cap and Chain WC Tank Repair Kit

SOOLINEY$8.093 rev

8mo ago

Hebewater Canister Flush Valve Replacement Kit Compatible with Kohler GP1229656 K-1188999 K-1188998 for AquaPiston System Includes Center Guide Cap and Chain Toilet Tank Repair Kit.

Hebewater$8.1467 rev

9mo ago

Toilet tank flush valve repair kit compatible with Kohler GP1229656 and used in AquaPiston single flush system including cover center guide rail and chain

Javiix$9.3211 rev

10mo ago

What buyers say about kohler aqua piston yellow cap

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

What buyers love

Size-Overall29%

“It fit and functions as it's supposed to”

Assembly/Installation14%

“It was so easy to put on”

Advertised Vs Actual Product10%

“As advertised”

Quality-Overall7%

“Great quality, great price, easy install”

Efficiency7%

“Works great”

Maintenance And Repair6%

“Perfect for repairing our toilet”

Value For Money5%

“Worth the money”

Ease Of Use5%

“Easy to Use, Works Perfectly”

Leak-Proof4%

“No more random leaks”

Instructions/User Manual/Troubleshooting2%

“quick delivery and good instructions”

What buyers complain about

Leak-Proof16%

“It leaks and the direction are unclear”

Product Condition8%

“Was not new in box”

Instructions/User Manual/Troubleshooting6%

“No instructions”

Advertised Vs Actual Product5%

“Incorrect Diagram and Part”

Assembly/Installation4%

“it was a pain to install”

Defective Material/Parts4%

“Yellow part breaks constantly”

Adhesion/Stickiness4%

“Yellow cap would not stay on after some use, so I had to super glue it on”

Design-Overall4%

“bad design”

Size-Overall3%

“It barely fit”

Add-Ons/Attachments3%

“Does not have correct piece to connect hose”

Top return reasons

Size-Overall57%

Defective Material/Parts12%

Compatibility-Overall12%

Advertised Vs Actual Product7%

Product Condition3%

Functionality-Overall2%

Value For Money2%

Maintenance And Repair2%

Leak-Proof2%

Assembly/Installation1%

Common questions

Is kohler aqua piston yellow cap profitable to sell on Amazon United States?: The niche generates $99K/yr across 16 tracked products. 1 of 6 products launched in the last 360 days are still selling. 90-day search growth is +1.9%. Flapen's verdict: Skip it (37/100).
How competitive is the kohler aqua piston yellow cap niche?: 9 brands and 65 sellers compete. The top 5 products take 77% of clicks and top 5 brands hold 93% of demand.
What do buyers complain about in kohler aqua piston yellow cap?: Top complaints mined from reviews: Leak-Proof, Product Condition, Instructions/User Manual/Troubleshooting. The return rate is 4.8%.
What does it cost to enter the kohler aqua piston yellow cap niche?: Listings span $6.74–$29.80; the average listing price is $15.48 (sweet spot $15–$100). The average incumbent carries 1,277 reviews — the moat a new listing must climb.