---
title: "Kohler Aqua Piston Yellow Cap — $99K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/tools-home-improvement/kohler-aqua-piston-yellow-cap"
last_updated: "2026-08-09T03:40:17.232Z"
locale: en
meta:
description: "Niche score 37/100 · $99K/yr market · 42K searches/yr · $15.48 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 37/100 · $99K/yr market · 42K searches/yr · $15.48 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Kohler Aqua Piston Yellow Cap — $99K/yr Amazon US Niche (2026) - Flapen"
---
# **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.
Market size 25Growth 27Conversion 97Competition 19Returns 28Price range 64Avg price 76Brand share 18Review moat 56Quality gap 18
**Conversion**
**Incredible****15.3%**
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**
**Good****1,277.38**
avg incumbent reviews — the moat a new listing must climb
**Returns**
**Okay****4.8%**
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**
**Bad****77%**
top-5 click share — a locked-up shelf
**Brand share**
**Bad****93%**
top-5 brand share — brand-locked demand
**Quality gap**
**Bad****4.7★**
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 ~~](https://flapen.com/research/methodology)
## **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**
**65**
**Top-5 brand share**
**93%**
Top 20: 100%
**Top-5 click share**
**77%**
Top 20: 100%
**Open market**
**5%**
- 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.
900700Nov '25Dec '25Jan '26Mar '26Apr '26May '26Jul '26
[**Open Trend **](https://flapen.com/research/us/tools-home-improvement/kohler-aqua-piston-yellow-cap/trend)
## **Top kohler aqua piston yellow cap search terms**
- **aqua piston repair kit**6K/yr+1.1%14.7% conv. - **kohler aqua piston yellow cap**6K/yr+14.1%12.9% conv. - **kohler aqua piston**3K/yr+36.3%9.6% conv. - **gp1229656**4K/yr+0.6%18.5% conv. - **kohler aqua piston repair kit**5K/yr-21.5%15.3% conv. - **kohler 1110586**4K/yr-2.7%5.3% conv. - **aquapiston**3K/yr+12.1%16.5% conv. - **kohler gp1229656**3K/yr+0.8%19.9% conv. - **aqua piston**4K/yr+0.1%10.6% conv. - **aquapiston repair kit for flush valve**3K/yr-11.6%13.7% conv. [**All search terms **](https://flapen.com/research/us/tools-home-improvement/kohler-aqua-piston-yellow-cap/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.
0%10%$10K20%$20K30%$30K40%$40K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
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
[1**KOHLER GENUINE PART 1188998 2 Toilet Canister Flush Valve Kit**Kohler**$17.57**4.7★1,435 rev](https://www.amazon.com/dp/B00CXRZH1U) [2**KOHLER GENUINE PART GP1229656 Canister Repair Kit For single flush canister toilets Includes cap center guide and chain**Kohler**$11.64**4.8★2,181 rev](https://www.amazon.com/dp/B0170823WC) [3**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**$8.14**4.6★67 rev](https://www.amazon.com/dp/B0FQ567T4J) [4**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**$8.09**5.0★3 rev](https://www.amazon.com/dp/B0G127HH4Q) [5**KOHLER 1117210 Flush Valve Kit 1.28**Kohler**$26.63**4.6★1,514 rev](https://www.amazon.com/dp/B009KX64K8)
**~~View all top sellers →~~**
### **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**$12.86**9 rev5mo ago](https://www.amazon.com/dp/B0GHW7J2XV) [**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**$7.83**8 rev7mo ago](https://www.amazon.com/dp/B0G1HMCJ8V) [**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**$8.09**3 rev8mo ago](https://www.amazon.com/dp/B0G127HH4Q) [**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**$8.14**67 rev9mo ago](https://www.amazon.com/dp/B0FQ567T4J) [**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**$9.32**11 rev10mo ago](https://www.amazon.com/dp/B0FP26GJBX)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**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**$8.09**5.0★**▲ 158%**](https://www.amazon.com/dp/B0G127HH4Q) [**GP1229656 Toilet Flush Valve Repair Kit Replacement for Kohler AquaPiston Canister Cap and Center Guide Assembly Fix Broken Flapper Valve Parts for One-Piece Toilets**LavishStream**$8.14**5.0★**▲ 122%**](https://www.amazon.com/dp/B0FSXFYQP5) [**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**$12.86**4.8★**▲ 107%**](https://www.amazon.com/dp/B0GHW7J2XV) [**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**$7.83**4.8★**▲ 91%**](https://www.amazon.com/dp/B0G1HMCJ8V) [**Toilet Canister Flush Valve Repair Kit Replacement for Kohler GP1229656 AquaPiston Flush Valve Cap & Guide Assembly for One-Piece Toilets Fix Broken Flapper Valve Parts**PuritySage**$12.28**5.0★**▲ 31%**](https://www.amazon.com/dp/B0FJRLJKCR)
**~~View all trending →~~**
## **What buyers say about kohler aqua piston yellow cap**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Size-Overall**29%
*“It fit and functions as it's supposed to”*
**Assembly/Installation**14%
*“It was so easy to put on”*
**Advertised Vs Actual Product**10%
*“As advertised”*
**Quality-Overall**7%
*“Great quality, great price, easy install”*
**Efficiency**7%
*“Works great”*
**Maintenance And Repair**6%
*“Perfect for repairing our toilet”*
**Value For Money**5%
*“Worth the money”*
**Ease Of Use**5%
*“Easy to Use, Works Perfectly”*
**Leak-Proof**4%
*“No more random leaks”*
**Instructions/User Manual/Troubleshooting**2%
*“quick delivery and good instructions”*
### **What buyers complain about **
**Leak-Proof**16%
*“It leaks and the direction are unclear”*
**Product Condition**8%
*“Was not new in box”*
**Instructions/User Manual/Troubleshooting**6%
*“No instructions”*
**Advertised Vs Actual Product**5%
*“Incorrect Diagram and Part”*
**Assembly/Installation**4%
*“it was a pain to install”*
**Defective Material/Parts**4%
*“Yellow part breaks constantly”*
**Adhesion/Stickiness**4%
*“Yellow cap would not stay on after some use, so I had to super glue it on”*
**Design-Overall**4%
*“bad design”*
**Size-Overall**3%
*“It barely fit”*
**Add-Ons/Attachments**3%
*“Does not have correct piece to connect hose”*
### **Top return reasons **
**Size-Overall**57%
**Defective Material/Parts**12%
**Compatibility-Overall**12%
**Advertised Vs Actual Product**7%
**Product Condition**3%
**Functionality-Overall**2%
**Value For Money**2%
**Maintenance And Repair**2%
**Leak-Proof**2%
**Assembly/Installation**1%
## **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.
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