Stainless steels will not rust, making them ideal for environments containing water or steam. Power-wise, being stainless or not doesn’t seem to be relevant. Telfon Coated finishing provides a smoother surface and can avoid electric shortening that causes sparks. One argument supporting the use of Telfon coated spring is that with a smoother surface the friction between the spring and the inner side of the piston can be reduced. Power-wise, being Telfon Coated or not does not seem to be relevant.
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