圧力 あつりょく調整 ちょうせい ではありませんでした
atsuryokuchōseikidewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 圧力調整器

1. Was not a pressure regulator.; Was not the pressure regulator.

Past/Perfective
Negative
Polite
Formal Register