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Wet-Dec 4 and Wet-Dec 5 have a 5mm upstand on the two sides of the corner gully. This is designed to support and stengthen. Chip out plaster and install flush with wall.
Wet-Dec 9 is the same as Wet-Dec 7 but with mitred 500mm extensions to extend the wet area to 1700mm x 1700mm. The purpose of the extensions is to eliminate difficulty with uneven floors and to ensure surplus water flows back into the shower area.