2 years to 25 years

来源: 于 2012-08-21 21:06:03 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

depends usage and gas quolity. I have a customer runing restaurant. a new tank use only 2 years. it was leaking. most 15 to 20 years, I saw one 25 years still working.