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7410 Rainwater spouting system (4)
7411 Rainwater spouting systems (51) Spouting and downpipes attached externally to the building fabric to receive water from roofs,
balconies, canopies, etc., convey it to integral sumps and outlets and thence to drains
7412 Rainwater systems (20) Special design piped internal or external disposal system, including full bore siphon systems, for taking rainwater from outlets in roofs, balconies, gutters, canopies, etc., on a building to the point where it connects to a stormwater drain or discharges into or over a gully, soakpit, etc.
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