This diaphragm is the sealing element inside the shut-off valve of a sprayer. It opens and closes the fluid path between the main boom line and the individual nozzle body, isolating sections when the valve is actuated. A torn or fatigued diaphragm causes the valve to leak, resulting in drips from the nozzle even when the section is turned off. The manufacturer produces this component to match the original valve body geometry, so the diaphragm seats correctly against the valve seat without requiring additional shimming or modification.