The Sunflower knapsack sprayer’s simple design and reliability guarantee long and efficient operation. This design features no viton seals however it is still a great applicator for soluble substances containing products for the protection of plants from diseases, weeds and pests.
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I'm very impressed with this sprayer. Unfortunately the instructions are in Polish! There's an extremely amateur video on Youtube which was only of limited help. However, once assembled it works like a dream.