Plural amounts in plural objects.

[Hecquaro]

Good day,

Taking this sentence coming from a technical guide:

"Flush buttons for 0,8 and 1,6 gallons flushes"

I would like if it is correct, or if it should be:

"Flush buttons for 0,8 and 1,6 gallon flushes"

or

"Flush buttons for 0,8 and 1,6 gallons flush"

In advance, thank you very much for your answer!

Olivier

[Hi_there_Carl]

"Flush buttons for 0,8 and 1,6 gallon flushes" is correct