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Birchmeier sprayer parts 21-psi constant flow valve for Flox 2.5-gal. (Item # 151246) and Iris 4-gal. (Item # 151247) backpack sprayers. Birchmeier sprayer valve will automatically maintain a constant flow at 21-psi resulting in fewer pumping strokes and easier pumping. The 21-psi Birchmeier sprayer valve is designed for herbicide application at low pressure where spray drift is a concern.
2018 Reference Guide: Page 230