1.Examine the finish of the valves. Stainless steel has a finish much brighter and more reflective than ordinary steel.
2 .Test the valves to find out if they're magnetic. Steel is magnetic, unlike copper or aluminum. All stainless steels are magnetic with the exception of austenitic grades; however, even some austenitics can become magnetized. If a magnet sticks to the valve, it is most likely steel.
3. Compare the magnetism of the valves to an ordinary piece of steel. Stainless steel has a weaker magnetic pull than ordinary steel. If your magnet sticks to the ordinary steel much better than the other valves, they are most likely stainless steel.
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