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.

mansfield flush valve seal

Skip it

Prices mostly outside the sweet spot ($5.92–$12.58) — this niche doesn't clear our bar today.

Conversion

Incredible15.5%

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

Review moat

Great242.43

avg incumbent reviews — the moat a new listing must climb

Returns

Good2.1%

return rate — above 5% kills the launch gate

Quality gap

Good4.5★

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

Bad73%

top-5 click share — a locked-up shelf

Brand share

Bad93%

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

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

Top-5 brand share

93%

Top 20: 100%

Top-5 click share

73%

Top 20: 100%

Open market

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.

Peak months: Sep · busiest ÷ quietest = 1.6×

Open 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.

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

Mansfield Plumbing 0030 Flush Valve Service Pack Fits 210/211 Flush Valve

Mansfield$5.924.6★1,343 rev

Mansfield Plumbing 630-0030 Flush Valve Seal Gasket for 210/211 - 3 PACK

Mansfield$12.584.6★547 rev

Flush Valve Seal for Mansfield 3 Pack Upgraded Silicone Material Toilet Tank Gasket Replacement Parts for 210 and 211 Equivalent to 630-0030

Ullnosoo$9.874.4★510 rev

Flush Valve Seal for Mansfield 2 Pack Upgraded Silicone Material Toilet Replacement Parts Tank Gasket for 210 and 211 Equivalent to 630-0030

Ullnosoo$7.494.4★198 rev

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$8.094.4★269 rev

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$11.973 rev

6mo ago

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$7.273 rev

6mo ago

630-0030 Flush Valve Seal for Mansfield 210/211 Toilet Flush Valves

RNTKAB$9.0914 rev

7mo ago

Silicone Toilet Flush Valve Seal Kit Compatible with Mansfield 210/211/160 Replacement for 630-0030 3-Pack

Fifatopo$7.9714 rev

10mo ago

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$7.9582 rev

1y ago

What buyers say about mansfield flush valve seal

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

What buyers love

Size-Overall17%

“Exact fit”

Assembly/Installation15%

“clean for installation”

Leak-Proof9%

“works without leaking”

Value For Money8%

“Worth it”

Maintenance And Repair7%

“Easy fix”

Advertised Vs Actual Product7%

“Exactly what you need”

Quality-Overall6%

“The performance has been excellent as well - no drips, no leaks, just a reliable seal”

Efficiency6%

“Works well”

Ease Of Use6%

“Easy fix”

Durability3%

“Looks like it's durable”

What buyers complain about

Leak-Proof21%

“When the valve starts leaking”

Material Quality10%

“Not oem material”

Durability9%

“Does not last”

Thickness6%

“Like the others Ive tried, the gasket seems too thin and/or stiff and doesnt seal fully”

Functionality-Overall5%

“didnt work”

Size-Overall5%

“they didn't fit properly”

Locking Mechanism3%

“This product does not seal”

Instructions/User Manual/Troubleshooting3%

“Bad Instructions”

Value For Money3%

“Don't waste your money - buy OEM”

Quality-Overall2%

“other brands are often cheaply made”

Top return reasons

Size-Overall58%

Leak-Proof10%

Compatibility-Overall8%

Advertised Vs Actual Product5%

Functionality-Overall5%

Defective Material/Parts4%

Value For Money3%

Thin1%

Thickness1%

Maintenance And Repair1%

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.