These sprayers are designed for the long haul. The o-ring and piston cup are constructed out of chemical resistant viton, You will not find these materials in lesser sprayers. Also, they have an extra large diameter siphon tube with a filter at the end of the siphon. The McKee's 37 Chemical Resistant Sprayer has a high-output design that can withstand most acid-based cleaners, degreasers, and all-purpose cleaners. This high quality sprayer fits any standard 16 or 32 oz. bottle.