Concern for your animals? No, you won't have a problem even with a little corrosion.
Long term reliability? Well that depends a little bit on what type of stainless steel and the design of the needle valve. You will likely get some pitting in crevices. I'm not sure how much it will matter to valve reliability as it really depends on the valve.
I would not worry about using the valves.
Last edited by rishma; 01/05/2013 at 11:44 PM.
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