Japanese for dual flush toilet


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.




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.




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.

