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10 cards from this deck
Pressure differences creating suction that empties water traps, allowing sewer gases to enter buildings
Waste pipe runs completely full, reduces pressure, creates suction that pulls water from trap
Water flowing down stack creates suction in connected waste pipe
Pressure buildup where stack changes direction at bottom
uPVC (unplasticised polyvinyl chloride)
When drain depth exceeds 1 metre
Drain heads, level changes, direction changes, new connections
100mm
Before backfilling
Three minutes
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