"ITEM IS 4 IN. DIA CYLINDER 2 IN. H ENCLOSING STEEL BELLOWS WITH TUBE THROUGH CENTER OF TOP AND L-SHAPED BRACKET OF CORROSION RESISTANT STEEL BOLTED NEAR EDGE OF TOP; INTENDED SERVICE IN SEAWATER,FRESH WATER,JET FUEL,GASOLINE,LUBE OIL,FUEL OIL,OR DIESEL OIL DETERMINES USE OF COPPER-NICKEL,MONEL,INCONEL,OR CORROSION RESISTING STEEL FOR SENSOR TUBING,HOUSING,OR BELLOWS"