嘩佬 [哗－]

Jyutping waa1 lou2
Pinyin huā lǎo

Definitions (粵典–words.hk)
  1. 名詞、外來語
    控制流​體​流量​、​壓力​同​流向​嘅​活​門​、​閥門
    valve
Definitions (Wiktionary)
  1. noun, Cantonese, Hong-Kong
    valve