---
title: "Mansfield Flush Valve Seal — $44K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/tools-home-improvement/mansfield-flush-valve-seal"
last_updated: "2026-08-09T00:51:12.497Z"
locale: en
meta:
description: "Niche score 40/100 · $44K/yr market · 33K searches/yr · $8.54 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 40/100 · $44K/yr market · 33K searches/yr · $8.54 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Mansfield Flush Valve Seal — $44K/yr Amazon US Niche (2026) - Flapen"
---
# **mansfield flush valve seal**
**Skip it**
Prices mostly outside the sweet spot ($5.92–$12.58) — this niche doesn't clear our bar today.
Market size 11Growth 36Conversion 97Competition 22Returns 73Price range 0Avg price 24Brand share 18Review moat 88Quality gap 50
**Conversion**
**Incredible****15.5%**
search→purchase rate — share of searches ending in a sale
**Review moat**
**Great****242.43**
avg incumbent reviews — the moat a new listing must climb
**Returns**
**Good****2.1%**
return rate — above 5% kills the launch gate
**Quality gap**
**Good****4.5★**
avg incumbent rating — lower means beatable quality
**Growth**
**Okay****+8.7%**
90-day search growth — must beat 0% to launch
**Avg price**
**Bad****$8.54**
avg listing price — sweet spot $15–$100
**Competition**
**Bad****73%**
top-5 click share — a locked-up shelf
**Brand share**
**Bad****93%**
top-5 brand share — brand-locked demand
**Market size**
**Bad****$44K**
$44K/yr · 33K searches
**Price range**
**Bad****$5.92–$12.58**
cheapest to priciest tracked listing — scored on the share inside $15–$100
According to Flapen's Amazon United States niche tracking, mansfield flush valve seal is a $44K/yr Amazon United States market (33K searches/yr). The top 5 brands hold 93% of demand. Demand peaks in Sep. Verdict: Skip it — 40/100.
Data updated Jul 27, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **mansfield flush valve seal market data**
- **Units sold / yr**
- **6K–8K**
- avg 500–750/product
- **Revenue / yr**
- **$51K–$68K**
- units × avg price
- **Conversion rate**
- **15.5%**
- **Avg BSR**
- **#596**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **79%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **41 months**
- **Avg seller age**
- **163 days**
## **Competition & brand share**
The top 5 products capture 73% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**9 **▼falling
**Sellers**
**54**
**Top-5 brand share**
**93%**
Top 20: 100%
**Top-5 click share**
**73%**
Top 20: 100%
**Open market**
**5%**
- Mansfield47% - Ullnosoo23% - RNTKAB11% - Korky7% - Hidnvefen4% - Fifatopo3% - Open — no brand owns it (3 brands, 5%)
## **Demand & seasonality**
Weekly Amazon search volume, last 100 weeks — +8.7% search growth over the last 90 days.
1K600Spike '25 seasonSepDecMarJunAugNovMarMay
Peak months: Sep · busiest ÷ quietest = 1.6×
[**Open Trend **](https://flapen.com/research/us/tools-home-improvement/mansfield-flush-valve-seal/trend)
## **Top mansfield 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%$4K20%$9K30%$13K40%$18K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 14 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Mansfield Plumbing 0030 Flush Valve Service Pack Fits 210/211 Flush Valve**Mansfield**$5.92**4.6★1,343 rev](https://www.amazon.com/dp/B00002N971) [2**Mansfield Plumbing 630-0030 Flush Valve Seal Gasket for 210/211 - 3 PACK**Mansfield**$12.58**4.6★547 rev](https://www.amazon.com/dp/B07PFLKXPB) [3**Flush Valve Seal for Mansfield 3 Pack Upgraded Silicone Material Toilet Tank Gasket Replacement Parts for 210 and 211 Equivalent to 630-0030**Ullnosoo**$9.87**4.4★510 rev](https://www.amazon.com/dp/B0C3Q3M3JX) [4**Flush Valve Seal for Mansfield 2 Pack Upgraded Silicone Material Toilet Replacement Parts Tank Gasket for 210 and 211 Equivalent to 630-0030**Ullnosoo**$7.49**4.4★198 rev](https://www.amazon.com/dp/B0CMGH1665) [5**Korky 457 2X Long Life Seal Fits Mansfield 210 and 211 Fixes Leaking Tower Style Valves and Hard-to-Flush Toilets-Easy to Install-Made in USA Red**Korky**$8.09**4.4★269 rev](https://www.amazon.com/dp/B0CTCZS7VT)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**8Pcs 630-0030 Flush Valve Seal Compatible with Mansfield 210 211 Flush Valves Flush Valve Seal Compatible with Mansfield 160 Toilet**CuraceQ**$11.97**3 rev6mo ago](https://www.amazon.com/dp/B0GJRWG87T) [**6 Pack Flush Valve Seal for Mansfield Fixed You Leaking Toilet Replacement Seal Silicone Flush Valve Toilet Tank Gasket Compatible With Mansfield p/n: 630-0030 (model 210 & 211) Red**Urkupoo**$7.27**3 rev6mo ago](https://www.amazon.com/dp/B0GFY68675) [**630-0030 Flush Valve Seal for Mansfield 210/211 Toilet Flush Valves**RNTKAB**$9.09**14 rev7mo ago](https://www.amazon.com/dp/B0G792J5G9) [**Silicone Toilet Flush Valve Seal Kit Compatible with Mansfield 210/211/160 Replacement for 630-0030 3-Pack**Fifatopo**$7.97**14 rev10mo ago](https://www.amazon.com/dp/B0FKNFNMH8) [**Flush Valve Seal for Mansfield 210/211 Flush Valve Upgraded Silicone Material Mansfield Toilet Replacement Parts 160 Toilet Gasket Equivalent to 630-0030 2Pcs**Hidnvefen**$7.95**82 rev1y ago](https://www.amazon.com/dp/B0F9NN4HZG)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**630-0030 Flush Valve Seal for Mansfield 210/211 Toilet Flush Valves**RNTKAB**$9.09**3.9★**▲ 224%**](https://www.amazon.com/dp/B0G792J5G9) [**6 Pack Flush Valve Seal for Mansfield Fixed You Leaking Toilet Replacement Seal Silicone Flush Valve Toilet Tank Gasket Compatible With Mansfield p/n: 630-0030 (model 210 & 211) Red**Urkupoo**$7.27**4.4★**▲ 222%**](https://www.amazon.com/dp/B0GFY68675) [**8Pcs 630-0030 Flush Valve Seal Compatible with Mansfield 210 211 Flush Valves Flush Valve Seal Compatible with Mansfield 160 Toilet**CuraceQ**$11.97**5.0★**▲ 217%**](https://www.amazon.com/dp/B0GJRWG87T) [**Silicone Toilet Flush Valve Seal Kit Compatible with Mansfield 210/211/160 Replacement for 630-0030 3-Pack**Fifatopo**$7.97**4.2★**▲ 153%**](https://www.amazon.com/dp/B0FKNFNMH8) [**Flush Valve Seal for Mansfield 2 Pack Upgraded Silicone Material Toilet Replacement Parts Tank Gasket for 210 and 211 Equivalent to 630-0030**Ullnosoo**$7.49**4.4★**▲ 34%**](https://www.amazon.com/dp/B0CMGH1665)
**~~View all trending →~~**
## **What buyers say about mansfield flush valve seal**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Size-Overall**17%
*“Exact fit”*
**Assembly/Installation**15%
*“clean for installation”*
**Leak-Proof**9%
*“works without leaking”*
**Value For Money**8%
*“Worth it”*
**Maintenance And Repair**7%
*“Easy fix”*
**Advertised Vs Actual Product**7%
*“Exactly what you need”*
**Quality-Overall**6%
*“The performance has been excellent as well - no drips, no leaks, just a reliable seal”*
**Efficiency**6%
*“Works well”*
**Ease Of Use**6%
*“Easy fix”*
**Durability**3%
*“Looks like it's durable”*
### **What buyers complain about **
**Leak-Proof**21%
*“When the valve starts leaking”*
**Material Quality**10%
*“Not oem material”*
**Durability**9%
*“Does not last”*
**Thickness**6%
*“Like the others Ive tried, the gasket seems too thin and/or stiff and doesnt seal fully”*
**Functionality-Overall**5%
*“didnt work”*
**Size-Overall**5%
*“they didn't fit properly”*
**Locking Mechanism**3%
*“This product does not seal”*
**Instructions/User Manual/Troubleshooting**3%
*“Bad Instructions”*
**Value For Money**3%
*“Don't waste your money - buy OEM”*
**Quality-Overall**2%
*“other brands are often cheaply made”*
### **Top return reasons **
**Size-Overall**58%
**Leak-Proof**10%
**Compatibility-Overall**8%
**Advertised Vs Actual Product**5%
**Functionality-Overall**5%
**Defective Material/Parts**4%
**Value For Money**3%
**Thin**1%
**Thickness**1%
**Maintenance And Repair**1%
## **Common questions**
- **Is mansfield flush valve seal profitable to sell on Amazon United States?**
- The niche generates $44K/yr across 14 tracked products. 0 of 4 products launched in the last 360 days are still selling. 90-day search growth is +8.7%. Flapen's verdict: Skip it (40/100).
- **How competitive is the mansfield flush valve seal niche?**
- 9 brands and 54 sellers compete. The top 5 products take 73% of clicks and top 5 brands hold 93% of demand.
- **What do buyers complain about in mansfield flush valve seal?**
- Top complaints mined from reviews: Leak-Proof, Material Quality, Durability. The return rate is 2.1%.
- **When does demand for mansfield flush valve seal peak?**
- Demand peaks in Sep; the busiest month runs 1.6× the quietest.
- **What does it cost to enter the mansfield flush valve seal niche?**
- Listings span $5.92–$12.58; the average listing price is $8.54 (sweet spot $15–$100). The average incumbent carries 242 reviews — the moat a new listing must climb.
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