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54

排水口 8cm

Worth a look

Shows low returns (0.6%), but pricing outside the sweet spot ($1007.28 avg) keeps it on the watch list.

Market size 78Growth 28Conversion 47Competition 42Returns 97Price range 0Avg price 0Brand share 61Review moat 71Quality gap 76

Returns

Incredible0.6%

return rate — above 5% kills the launch gate

Market size

Great¥1.0M

¥1.0M/yr · 27K searches

Quality gap

Great4.3★

avg incumbent rating — lower means beatable quality

Review moat

Good666.38

avg incumbent reviews — the moat a new listing must climb

Brand share

Good68%

top-5 brand share — brands hold most of the demand

Conversion

Okay3.7%

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

Competition

Okay60%

top-5 click share — leaders hold, buyers still browse

Growth

Okay+2.7%

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

Avg price

Bad¥1007.28

avg listing price — sweet spot $15–$100

Price range

Bad¥302.65–¥3214.61

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

According to Flapen's Amazon Japan niche tracking, 排水口 8cm is a ¥1.0M/yr Amazon Japan market (27K searches/yr). The top 5 brands hold 68% of demand. Demand peaks in Apr. Verdict: Worth a look — 54/100.

Data updated Jul 31, 2026 · scored weekly · How we score niches

排水口 8cm market data

Units sold / yr
1K–1K
avg 0–100/product
Revenue / yr
¥1.0M–¥1.3M
units × avg price
Conversion rate
3.7%
Avg BSR
#45
Page quality
0%
Prime
95%
Sponsored
76%
Out of stock
0.0%
Avg brand age
48 months
Avg seller age
181 days

Competition & brand share

The top 5 products take 60% of clicks — established leaders, but buyers still shop beyond them.

Brands

14 falling

Sellers

54

Top-5 brand share

68%

Top 20: 100%

Top-5 click share

60%

Top 20: 99%

Open market

23%

  • GAONA(ガオナ)22%
  • KEEP FINE15%
  • Zthluyc11%
  • AIEVE11%
  • コモライフ10%
  • ノーブランド品9%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +2.7% search growth over the last 90 days.
900700Spike '25Prime Day '25Spike '26SepDecMarJunAugNovMarMay

Peak months: Apr · busiest ÷ quietest = 1.6×

Top 排水口 8cm search terms

  • 排水口 8cm8K/yr
  • 排水口カバー 8cm6K/yr
  • 排水溝カバー 8cm7K/yr
  • ミニキッチン 排水口6K/yr
All search terms

Top 排水口 8cm 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%4%¥41K8%¥82K12%¥123K16%¥164K1101001K10K Reviews — right = deep review moat Market share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 21 tracked products in this niche — three views at once, no toggling.

What buyers say about 排水口 8cm

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

What buyers love

清掃の容易さ22%

“お手入れは楽”

サイズ全体19%

“ぴったりで期待通りでした”

使用の容易さ13%

“ステンレス製でサビにくく、お手入れもしやすいのが嬉しいポイント。”

耐久性5%

“ステンレス製で耐久性も良く、使い勝手も良い。”

コストパフォーマンス5%

“値段相応の耐久力”

総合品質5%

“大変良い商品です。”

強さ3%

“ステンレスで丈夫”

スプレー/フロー3%

“流れ良く、真ん中に水が溜まらないので素晴らしいです。”

匂い3%

“防臭ワン6センチにジャストフィット”

材料の品質2%

“ステンレス製最高”

What buyers complain about

匂い12%

“排水口が臭わなくなる”

サイズ全体11%

“小さい”

使用の容易さ8%

“単体では使いづらいかも”

清掃の容易さ6%

“プラスチック製で洗いにくく、ずっとストレスでした。”

厚み6%

“薄目のタイプです。”

排水6%

“流しがつまりにくくなりました”

スプレー/フロー5%

“全く流れない”

5%

“ステンレスシンクには色味が合わない”

生锈/腐食する3%

“プラスチック製のときは少しサボるとすぐヌメりが出ていましたが、ステンレスに変えてからはヌメりが格段に出にくくなりました。”

形状/スタイル3%

“なぜあの形なのでしょうね..”

Top return reasons

サイズ全体70%
広告と実際の製品の違い7%
不良材料/部品4%
傷に強い3%
互換性-全体3%
形状/スタイル2%
水に強い1%
組み立て/インストール1%
機能全体1%
1%

Common questions

Is 排水口 8cm profitable to sell on Amazon Japan?
The niche generates ¥1.0M/yr across 21 tracked products. 2 of 2 products launched in the last 360 days are still selling. 90-day search growth is +2.7%. Flapen's verdict: Worth a look (54/100).
How competitive is the 排水口 8cm niche?
14 brands and 54 sellers compete. The top 5 products take 60% of clicks and top 5 brands hold 68% of demand.
What do buyers complain about in 排水口 8cm?
Top complaints mined from reviews: 匂い, サイズ全体, 使用の容易さ. The return rate is 0.6%.
When does demand for 排水口 8cm peak?
Demand peaks in Apr; the busiest month runs 1.6× the quietest.
What does it cost to enter the 排水口 8cm niche?
Listings span ¥302.65–¥3214.61; the average listing price is ¥1007.28 (sweet spot $15–$100). The average incumbent carries 666 reviews — the moat a new listing must climb.