English: Pictures showing two traps located underneath a drain cover. The centre image shows a few insects stuck to the underside of the cover. The cover functions as a trap by blocking the back flow of gasses using the trapped water and any positive pressure in the pipe will cause the cover to come out.
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2008-02-08 16:10 KLLvr283 4096×3072× (2217540 bytes) {{Information |Description=Pictures showing two traps located underneath a drain cover. The centre image shows a few insects stuck to the underside of the cover. The cover functions as a trap by blocking the back flow of gasses using the trapped water and
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{{BotMoveToCommons|en.wikipedia|year={{subst:CURRENTYEAR}}|month={{subst:CURRENTMONTHNAME}}|day={{subst:CURRENTDAY}}}} {{Information |Description={{en|Pictures showing two traps located underneath a drain cover. The centre image shows a few insects stuc