Most sprayers aren't particularly convenient, but the Milwaukee M12 Handheld Sprayer has the potential to change your outlook.
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M12™ 1 Gallon Handheld Sprayer Kit
M12™ 1 Gallon Handheld Sprayer Kit
Milwaukee M12 Handheld Sprayer Review - PTR
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Milwaukee M12 Handheld Sprayer 2 Gal. Tank (1 Tank) 49-16-2762 - The Home Depot
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Milwaukee 49-16-2761 1 Gallon Handheld Sprayer Tank