Smith Performance Sprayers S100 1-Gallon Stainless Steel Compression Sprayer for Pest Control AISI-304 grade stainless steel tank with wide mouth opening built to withstand harsh chemicals along with rugged transport and use Stainless steel wand containing a no-drip valve stem with integrated filter Viton seals, gaskets and check-valves through the pump and shut-off Pull button pressure release valve safely releases internal pressure prior to opening the tank Gauge monitors pressure where PSI is critical for consistent and even application of chemicals