Smith Performance Sprayers 190448 Concrete Sprayer, Stainless Steel 3.5 gallon capacity AISI-304 grade stainless steel tank (no need for epoxy coatings) built to withstand harsh concrete chemicals along with rugged transport and use Brass, 24 inch wand and shut off with the highest quality Viton seals for maximum chemical resistance Four prong locking mechanism secures the pump tightly against an internal O-ring and also prevents over compression Faster, easier repair - pump seals can be changed within minutes, which equals less downtime Pull button pressure release valve safely releases internal pressure prior to opening the tank This is an O.E.M. part