1. changed to type B vent pipe. 2. modified angle of vent into t

来源: borisg 于 2015-03-02 16:27:14 [] [博客] [旧帖] [给我悄悄话] 阅读数 : 0 (90 bytes)

the bridge valves are for increase circulation and reduce time for hot water to come out.

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