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OsmaDrain, foul and surface water drainage system for use in gravity drainage applications at depths of up to 10m. Bottle gully rising piece for height adjustment For use with 4D900 and 4D901 Bottle Gullies 160mm diameter and 325mm long Simply remove the cover and frame from the Gully body and insert riser piece. Solvent weld cover and frame into pipe (riser) end