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floor drain 同gully trapped 有咩分別 - Discuss. com. hk Gully trapped, which is made of a concrete box with trap inside and grating on top for OTG for collection of waste water on floor or cover on top with vent pipe for STG BIGT, is connected to foul water manhole for waste main stack from building, it should be connected to STG BIGT before to foul water manhole
floor drain 同gully trapped 有咩分別(頁 1) - 工程 Engineering - 香港討論 . . . Gully trapped, which is made of a concrete box with trap inside and grating on top for OTG for collection of waste water on floor or cover on top with vent pipe for STG BIGT, is connected to foul water manhole for waste main stack from building, it should be connected to STG BIGT before to foul water manhole