Solo 405-B 1-Gallon Handheld Bleach Tank Sprayer, with Viton Seals for Use in Concrete Preparation &Treatment Safely sprays bleach solutions to remove mildew, algae, and other unwanted materials caused by flooding. Constructed with Viton ; Seals for use with bleach and other harsh chemicals to ensure long service and durability. Durable, all-poly construction for use with bleach and other cleaners Durable poly wand with poly nozzle adjusts from straight stream to a fine mist. Built-In Funnel Top for easy fill-up. Pressure Relief Valve vents excess pressure. Easy Grip Shut-off Valve reduces fatigue.