Chapin 79500 FKM Seal Knapsack Sprayer, 15.1 litresChapin 79500 FKM Seal Knapsack Sprayer, 15. 1 litres The Chapin Euro Style Backpack Sprayer has the traditional look and feel of a backpack sprayer with padded shoulder straps for a close fit to the back and a standard left hand pump handle. Sprayer features: A 15. 1 litre translucent plastic tank has a 4 inch wide mouth opening for easy filling, cleaning, and checking fluid levels 2 Stage filtration system, one filter at the top and another filter at