Before revision: Hopper, pipes and lifting cap components of a tremie concrete placement tube A tremie is a watertight pipe, usually of about 250mm inside diameter (150 to 300 mm), with a conical hopper at its upper end above the water level.
After revision: Assembled tremie placing concrete underwaterHopper, pipes and lifting cap components of a tremie concrete placement tube A tremie is a watertight pipe, usually of about 250mm inside diameter (150 to 300 mm), with a conical hopper at its upper end above the water level.