Smith Performance Sprayers Professional Stainless Steel Shut-Off 182866 features easy-to-change Viton seals throughout the shut-off made from A-Grade AISI-304 stainless steel make it highly resistant to harsh chemicals. Designed for use with Smith Performance Sprayers S100 1-Gallon Stainless Steel Compression Sprayer and the NL403 No-Leak Backpack Sprayer.