Harwil Corp.”sL-21 N (Noryl) or L-21CR (Celanese Fortron -for corrosive materials)level floats are closed-cell foam units that provide buoyancy tooperate in lower specific-gravity liquids. The floats can be machinedto specific sizes, allowing the L-21 to be mounted in a standardtwo-inch diameter vertical tee or any small tank setup.
