Noun and する verb
ろうすい
どんなに値段が高くても、その漏水検出器を買うべきだと思います。
No matter how expensive it is, we should buy the water leakage sensor.
A leak of water is a water leakage.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.