---
title: "Flush Valve Seal — $68K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/tools-home-improvement/flush-valve-seal"
last_updated: "2026-08-09T04:02:47.434Z"
locale: en
meta:
description: "Niche score 51/100 · $68K/yr market · 80K searches/yr · $9.88 avg price. A small market ($68K/yr) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 51/100 · $68K/yr market · 80K searches/yr · $9.88 avg price. A small market ($68K/yr) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Flush Valve Seal — $68K/yr Amazon US Niche (2026) - Flapen"
---
# **flush valve seal**
**Worth a look**
Shows searches that convert (8.7% search→purchase), but a small market ($68K/yr) keeps it on the watch list.
Market size 17Growth 45Conversion 82Competition 43Returns 65Price range 67Avg price 32Brand share 49Review moat 58Quality gap 82
**Conversion**
**Great****8.7%**
search→purchase rate — share of searches ending in a sale
**Quality gap**
**Great****4.2★**
avg incumbent rating — lower means beatable quality
**Price range**
**Good****$4.53–$36.21**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Returns**
**Good****2.4%**
return rate — above 5% kills the launch gate
**Review moat**
**Good****1,190.89**
avg incumbent reviews — the moat a new listing must climb
**Brand share**
**Okay****76%**
top-5 brand share — brands hold most of the demand
**Growth**
**Okay****+16.1%**
90-day search growth — must beat 0% to launch
**Competition**
**Okay****59%**
top-5 click share — leaders hold, buyers still browse
**Avg price**
**Okay****$9.88**
avg listing price — sweet spot $15–$100
**Market size**
**Bad****$68K**
$68K/yr · 80K searches
**Signals**[** Low Review Barrier**](https://flapen.com/research/niches?market=us&signal=low_review_barrier "Top brand's reviews < 500")
According to Flapen's Amazon United States niche tracking, flush valve seal is a $68K/yr Amazon United States market (80K searches/yr). The top 5 brands hold 76% of demand. Demand peaks in Aug. Verdict: Worth a look — 51/100.
Data updated Jul 27, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **flush valve seal market data**
- **Units sold / yr**
- **6K–8K**
- avg 100–250/product
- **Revenue / yr**
- **$59K–$79K**
- units × avg price
- **Conversion rate**
- **8.7%**
- **Avg BSR**
- **#2,694**
- **Page quality**
- **0%**
- **Prime**
- **89%**
- **Sponsored**
- **84%**
- **Out of stock**
- **5.0%**
- **Avg brand age**
- **27 months**
- **Avg seller age**
- **153 days**
## **Competition & brand share**
The top 5 products take 59% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**14 **▼falling
**Sellers**
**85**
**Top-5 brand share**
**76%**
Top 20: 100%
**Top-5 click share**
**59%**
Top 20: 100%
**Open market**
**19%**
- HUTUDAN27% - Fluidmaster20% - Ruinuonice11% - CTEAKOP11% - TOHAXPLS6% - Kohler5%
## **Demand & seasonality**
Weekly Amazon search volume, last 100 weeks — +16.1% search growth over the last 90 days.
3K2KPrime Day '25 seasonSepDecMarJunAugNovMarMay
Peak months: Aug · busiest ÷ quietest = 1.7×
[**Open Trend **](https://flapen.com/research/us/tools-home-improvement/flush-valve-seal/trend)
## **Top flush valve seal search terms**
- **toilet fill valve seal**24K/yr+13.1%6.4% conv. - **fluidmaster 242 toilet fill valve seal**9K/yr+8.2%10.3% conv. - **fluidmaster 242**8K/yr+39.4%7.5% conv. - **toilet valve seal**8K/yr+15.2%5.0% conv. - **fluidmaster toilet fill valve seal**11K/yr-19.5%6.9% conv. - **fluidmaster fill valve seal**4K/yr+63.4%6.4% conv. - **kohler fill valve seal**4K/yr+19.0%8.3% conv. - **fill valve seal**5K/yr+15.8%8.8% conv. - **fluidmaster seal**3K/yr+38.4%3.8% conv. - **toilet fill valve seal replacement**3K/yr+60.0%7.6% conv. [**All search terms **](https://flapen.com/research/us/tools-home-improvement/flush-valve-seal/search-terms)
## **Top flush valve seal 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%$7K20%$14K30%$20K40%$27K1101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 19 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**3 Pack Toilet Fill Valve Seal replacement for Kohler 83143 - Compatible with Fluidmaster 200/242/400/747 Models - Durable Rubber Diaphragm Assembly for DIY Leak Prevention & Tank Repair**HUTUDAN**$6.61**4.2★97 rev](https://www.amazon.com/dp/B0G1TV9T4N) [2**CTEAKOP 2 Pcs Black Toilet Fill Valve Seal Replacement Part Rubber Toilet Parts Inside Tank Kit Flush Valve Seal for Fluidmaster 200 747 and 400 Models Toilet Fill Valve**CTEAKOP**$5.97**4.1★70 rev](https://www.amazon.com/dp/B0F8VDVNRW) [3**Ruinuonice Toilet Fill Valve Seal Replacement Part for Kohler 83143 - Compatible with Fluidmaster 242/400/747 - Rubber Diaphragm Assembly for DIY Toilet Tank Repair & Leak Prevention (Black-1Pack)**Ruinuonice**$5.39**3.9★66 rev](https://www.amazon.com/dp/B0DZWV8ZZY) [4**Fluidmaster 242 Toilet Fill Valve Seal Replacement Part Fits 400A Fill Valve (10)**Fluidmaster**$22.80**4.6★172 rev](https://www.amazon.com/dp/B07ZJVSLYR) [5**Fluidmaster 400H-002 Performax Universal Toilet Fill Valve High Performance Tank and Bowl Water Control 1-Pack Multicolor**Fluidmaster**$14.89**4.6★16,896 rev](https://www.amazon.com/dp/B07N7BH94Q)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**3 Pack Toilet Fill Valve Seal replacement for Kohler 83143 - Compatible with Fluidmaster 200/242/400/747 Models - Durable Rubber Diaphragm Assembly for DIY Leak Prevention & Tank Repair**HUTUDAN**$6.61**97 rev8mo ago](https://www.amazon.com/dp/B0G1TV9T4N) [**Waziaqoc 2 Pcs Toilet Fill Valve Seal Replacement**Waziaqoc**$5.22**7 rev9mo ago](https://www.amazon.com/dp/B0FVRXF2W2) [**6 PCS 83143 Toilet Fill Valve Seal Replacement - Compatible with Fluidmaster-200/242/400/747 Black Rubber Toilet Fill Valve Seal Replacement Part Durable Toilets Tank Part Diaphragm**Pretwad**$6.95**33 rev11mo ago](https://www.amazon.com/dp/B0FP4C8Z6X) [**For Kohler Fluidmaster Toilet Fill Valve Seal Kit**Azanxo**$7.88**8 rev11mo ago](https://www.amazon.com/dp/B0FP2J5Z8H) [**83143 Toilet Fill Valve Seal 2 Pack Fit for Kohler Fluidmaster**ZanFyxil**$8.33**12 rev1y ago](https://www.amazon.com/dp/B0F242VGXR)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**3 Pack Toilet Fill Valve Seal replacement for Kohler 83143 - Compatible with Fluidmaster 200/242/400/747 Models - Durable Rubber Diaphragm Assembly for DIY Leak Prevention & Tank Repair**HUTUDAN**$6.61**4.2★**▲ 142%**](https://www.amazon.com/dp/B0G1TV9T4N) [**KOHLER 83143 Genuine Part Unfinished Seal Diaphragm**Kohler**$7.49**4.6★**▲ 102%**](https://www.amazon.com/dp/B007B4UY6I) [**HONSNKS 2 Pcs 83143 Toilet Fill Valve Seal Replacement Universal Rubber Diaphragm for Fluid-master 200 242 400 and 747 Models Easy DIY Fix (Black)**HONSNKS**$7.27**4.1★**▲ 76%**](https://www.amazon.com/dp/B0FCFB49YW) [**Waziaqoc 2 Pcs Toilet Fill Valve Seal Replacement**Waziaqoc**$5.22**3.4★**▲ 75%**](https://www.amazon.com/dp/B0FVRXF2W2) [**Toilet Fill Valve Seal 242 For 200 400 and 747 Models**Fluidmaster**$36.21**5.0★**▲ 44%**](https://www.amazon.com/dp/B01M4P6EIM)
**~~View all trending →~~**
## **What buyers say about flush valve seal**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Assembly/Installation**31%
*“Easy fix”*
**Efficiency**8%
*“Works great”*
**Value For Money**7%
*“Good price”*
**Size-Overall**7%
*“Fit well”*
**Advertised Vs Actual Product**6%
*“As advertised”*
**Ease Of Use**6%
*“Easy as pie”*
**Quality-Overall**6%
*“The build quality feels solid”*
**Instructions/User Manual/Troubleshooting**5%
*“Instructions are clear”*
**Maintenance And Repair**2%
*“Easy fix”*
**Adjustability/Rotatability/Reclining**2%
*“Very adjustable”*
### **What buyers complain about **
**Leak-Proof**18%
*“leaking in to the tank”*
**Noise Level**13%
*“Random noises”*
**Durability**8%
*“broke almost instantly”*
**Size-Overall**8%
*“it was very tight inside the tank”*
**Functionality-Overall**7%
*“Did not function”*
**Quality-Overall**5%
*“Garbage”*
**Compatibility-Overall**4%
*“Perhaps it wasn't fully compatible”*
**Value For Money**3%
*“Not what we were expecting for the price”*
**Product Condition**3%
*“Used. Arrived used. Was cleaned”*
**Design-Overall**2%
*“Good product bad nut design”*
### **Top return reasons **
**Size-Overall**29%
**Leak-Proof**16%
**Functionality-Overall**11%
**Defective Material/Parts**11%
**Compatibility-Overall**8%
**Value For Money**5%
**Advertised Vs Actual Product**4%
**Product Condition**3%
**Assembly/Installation**2%
**Noise Level**2%
## **Common questions**
- **Is flush valve seal profitable to sell on Amazon United States?**
- The niche generates $68K/yr across 19 tracked products. 1 of 4 products launched in the last 360 days are still selling. 90-day search growth is +16.1%. Flapen's verdict: Worth a look (51/100).
- **How competitive is the flush valve seal niche?**
- 14 brands and 85 sellers compete. The top 5 products take 59% of clicks and top 5 brands hold 76% of demand.
- **What do buyers complain about in flush valve seal?**
- Top complaints mined from reviews: Leak-Proof, Noise Level, Durability. The return rate is 2.4%.
- **When does demand for flush valve seal peak?**
- Demand peaks in Aug; the busiest month runs 1.7× the quietest.
- **What does it cost to enter the flush valve seal niche?**
- Listings span $4.53–$36.21; the average listing price is $9.88 (sweet spot $15–$100). The average incumbent carries 1,191 reviews — the moat a new listing must climb.
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