Solo 407-CI 3-Gallon Handheld Concrete Tank Sprayer with Viton Seals for Use in Concrete Preparation &Treatment Heavy -duty polyethylene tank with ultra-violet inhibitors; will not dent, crack, or corrode Viton seals provide excellent protection against the effects of harsh solvents Extra long 4' chemical resistant, nylon reinforced, hose provides extended reach and durability Pressure relief valve automatically releases pressure at 45 psi to avoid over pressurization; Allows manual release of pressure as well Built-In inflation valve allows pressurizing sprayer using an air compressor or portable air tank