Chapin 61500 Euro Style Backpack Poly Chapin 61808 Sprayer - 4 Gallon Capacity. Chapin is known in the industry to make the best quality sprayer that will get the job done right the first time. Purchase this sprayer from the market leader in the industry. Features include: Adjustable cone and fan nozzles included, Padded adjustable straps, 4-Inch large opening with removable strainer and a Poly Spray handle.