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52

tkgg31e 泡沫キャップ

Worth a look

Shows beatable incumbent ratings (3.9★), but brand-locked demand (top 5 brands take 100% of clicks) keeps it on the watch list.

Market size 62Growth 83Conversion 62Competition 5Returns 92Price range 0Avg price 0Brand share 0Review moat 83Quality gap 96

Quality gap

Incredible3.9★

avg incumbent rating — lower means beatable quality

Returns

Great1.1%

return rate — above 5% kills the launch gate

Growth

Great+81.0%

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

Review moat

Great340

avg incumbent reviews — the moat a new listing must climb

Market size

Good¥551K

¥551K/yr · 13K searches

Conversion

Good5.4%

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

Competition

Bad93%

top-5 click share — a locked-up shelf

Brand share

Bad100%

top-5 brand share — brand-locked demand

Avg price

Bad¥813.13

avg listing price — sweet spot $15–$100

Price range

Bad¥309.20–¥1368.96

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

According to Flapen's Amazon Japan niche tracking, tkgg31e 泡沫キャップ is a ¥551K/yr Amazon Japan market (13K searches/yr). The top 5 brands hold 100% of demand. Verdict: Worth a look — 52/100.

Data updated Jul 30, 2026 · scored weekly · How we score niches

tkgg31e 泡沫キャップ market data

Units sold / yr
750–1K
avg 100–250/product
Revenue / yr
¥610K–¥813K
units × avg price
Conversion rate
5.4%
Avg BSR
#137
Page quality
0%
Prime
100%
Sponsored
29%
Out of stock
0.0%
Avg brand age
54 months
Avg seller age
159 days

Competition & brand share

The top 5 products capture 93% of clicks — a locked-up shelf that new listings rarely crack.

Brands

4 rising

Sellers

35

Top-5 brand share

100%

Top 20: 100%

Top-5 click share

93%

Top 20: 100%

Open market

0%

  • TOTO67%
  • SANEI(サンエイ)19%
  • ノーブランド品9%
  • rainbowyou4%
  • Open — no brand owns it (0%)

Demand

Weekly Amazon search volume, last 30 weeks — +81.0% search growth over the last 90 days.
350250Spike '26Jan '26Feb '26Mar '26Apr '26May '26Jun '26

Top tkgg31e 泡沫キャップ search terms

  • toto 蛇口 パーツ5K/yr
  • tkgg31e 泡沫キャップ5K/yr
  • thyb68-13K/yr
All search terms

Top tkgg31e 泡沫キャップ 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%15%¥83K30%¥165K45%¥248K60%¥331K1101001K10K Reviews — right = deep review moat Market share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 7 tracked products in this niche — three views at once, no toggling.

What buyers say about tkgg31e 泡沫キャップ

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

What buyers love

組み立て/インストール20%

“取り付け楽チン”

使用の容易さ19%

“シンプルイズベスト”

清掃の容易さ8%

“シンク周りが清潔に保てます。”

コストパフォーマンス8%

“コスパがいい”

総合品質6%

“良品”

漏れ防止5%

“水漏れもなく”

水の流れ3%

“水がいき届き良かったです。”

圧力3%

“水圧も申し分ありません。”

サイズ全体2%

“ピッタリサイズ”

追加アイテム/添付ファイル2%

“取り付けるためのアタッチメントもたくさん付いてくるので、合うものがあるかもしれません。”

What buyers complain about

漏れ防止18%

“めちゃくちゃ水漏れする”

サイズ全体14%

“小さいがないと困る”

追加アイテム/添付ファイル5%

“アタッチメントのどれも合わず取り付け不可でした。”

使用説明書/ユーザーマニュアル/トラブルシューティング4%

“説明書は全くわからなかった”

使用の容易さ4%

“装着出来ない”

コストパフォーマンス4%

“お金がもったいないので絶対買わないほうがいいです。”

耐久性3%

“中央部がパリッと割れてしまいました。”

生锈/腐食する3%

“水場で使うのに錆びる”

総合品質3%

“ゴミになりました。”

不良材料/部品3%

“不良品”

Top return reasons

サイズ全体33%
漏れ防止16%
互換性-全体12%
追加アイテム/添付ファイル9%
組み立て/インストール6%
不良材料/部品5%
広告と実際の製品の違い4%
使用の容易さ4%
メカニズムの問題2%
接続性 - 全体2%

Common questions

Is tkgg31e 泡沫キャップ profitable to sell on Amazon Japan?
The niche generates ¥551K/yr across 7 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is +81.0%. Flapen's verdict: Worth a look (52/100).
How competitive is the tkgg31e 泡沫キャップ niche?
4 brands and 35 sellers compete. The top 5 products take 93% of clicks and top 5 brands hold 100% of demand.
What do buyers complain about in tkgg31e 泡沫キャップ?
Top complaints mined from reviews: 漏れ防止, サイズ全体, 追加アイテム/添付ファイル. The return rate is 1.1%.
What does it cost to enter the tkgg31e 泡沫キャップ niche?
Listings span ¥309.20–¥1368.96; the average listing price is ¥813.13 (sweet spot $15–$100). The average incumbent carries 340 reviews — the moat a new listing must climb.