Body in AlMg3 light alloy sheet, anodized (10 micron). Upper rim dia. 20 mm with inner strengthening. Smooth head-welded surfaces. Watertight bottom, completely welded to walls. Drain tap. Extractable perforated double bottom
Bottom light alloy frame. All around light alloy buffer. 2 fixed and 2 swivelling wheels dia 200 with non-marking rubber ring and zinc-plated housings.