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What's the Japanese for dual flush toilet, a flush toilet that allows you to
choose either a large flush (大) or small flush (小)?

Google translate suggests "デュアル水洗トイレ" (katakana for "dual" plus "flush
toilet"), but the [Japanese Wikipedia article on flush
toilets](https://ja.wikipedia.org/wiki/%E6%B0%B4%E6%B4%97%E5%BC%8F%E4%BE%BF%E6%89%80)
doesn't have "デュアル" in it, nor does the Japanese Wikipedia article on [toilets
in
Japan](https://ja.wikipedia.org/wiki/%E6%97%A5%E6%9C%AC%E3%81%AE%E4%BE%BF%E6%89%80)
(a google search for オーストラリアの便所 didn't help, either). jisho.org doesn't have
anything matching ["dual flush"](http://jisho.org/search/dual%20flush) or any
relevant matches using
[デュアル](http://jisho.org/search/%E3%83%87%E3%83%A5%E3%82%A2%E3%83%AB%20%23words?page=2)
(and based on this search for
[dual](http://jisho.org/search/dual%20%23words?page=4) there's only one
katakana form for "dual").

Searching ejje for [dual flush
toilet](http://ejje.weblio.jp/content/Dual+flush+toilet) just supplied the
English language Wikipedia article.

linguee.jp had one match for [dual
flush](http://www.linguee.jp/%E6%97%A5%E6%9C%AC%E8%AA%9E-%E8%8B%B1%E8%AA%9E/search?source=auto&query=dual%20flush):
"二重流し水洗トイレ", from Australia's main tourism site.

Maybe there's a semantic gap, because Japan doesn't have many single-flush
toilets.
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translation
Japanese for dual flush toilet
There might be somewhat of a semantic gap, most people won't ever need to use
the word, discussion about toilet models would much more concerned about
washlets, rather than dual flush.

It seems however that the correct form would be "デュアル水洗式トイレ" rather than
"デュアル水洗トイレ" that mostly Chinese sites use, specifically with regard to this
<http://ja.myecom.net/english/blog/2015/028465/> and this
<http://www.sekaimon.com/us/71284/Toilets/151176694826/> occurrence.

I've found [one case of デュアルフラッシュ in a
PDF](https://www.jpo.go.jp/shiryou/pdf/gidou-houkoku/22lavatory_wash.pdf), but
this is usually the transcription of "dual flash", so not recommended
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In reality, this is not a very common topic of conversation in Japan because,
as you so stated, the dual flush is just the norm here. Every time I see/hear
the system mentioned, it is mentioned by a non-Japanese person who has visited
Japan.

If, however, you need a term for a possible future discussion on the topic
with a Japanese-speaker, you might use one such as
「[大小]{だいしょう}[切り替え]{きりかえ}[式]{しき}」、「大小切り替えタイプ」, etc.

I could not promise that these are the most common ways to describe it as I
have never actively talked about it with anyone, but I could promise that at
least virtually every Japanese-speaker would understand what you are referring
to if you used them.

You could say (and be completely understood) things like:

「大小切り替え式の[水洗]{すいせん}トイレ」

「日本のトイレには『大小切り替えレバー』がついています。」 レバー = lever

**_Less than 1% of us would understand 「デュアル[水洗]{すいせん}トイレ」 if you trust me._**
Ask any other native speakers.
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Maybe it would help if you share what you need this for. If it's to convey to
someone you want to purchase a toilet with both flush types "二重流し水洗トイレ" or
大小切り替えタイプ will get the message across. I'm sure any japanese person will
figure out you want a toilet with both flush patterns.

If it was me I would say "大・小水洗付きトイレ" (read ”だい・しょう・すいせんつきトイレ”)
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