Restore consistent hydraulic function and prevent costly water leaks in your lever group espresso machine with the genuine Bush Check Valve, Lever Group (Part # A.5.063) from Kaldi.com. This precision-engineered OEM component is absolutely critical for maintaining the one-way water flow necessary for stable pre-infusion and accurate brewing pressure. Featuring durable, food-grade materials and built to the exact specifications of the original manufacturer, this check valve ensures that water does not backflow into the system, which can cause pressure drops and inconsistent espresso extraction. If you are experiencing problems like a "leaking lever espresso group head" or "inconsistent pre-infusion pressure on my La Marzocco Leva," this bush check valve is the reliable solution. The Bush Check Valve operates using a spring-loaded mechanism that precisely controls the flow direction within the lever group's hydraulic circuit. Its robust construction ensures long-term resistance against high temperatures and mineral buildup, guaranteeing extended operational life. Usage is straightforward for certified technicians: this part is installed within the lever assembly, and its proper function is essential for machines that utilize a mechanical pre-infusion phase. Key benefits include eliminating steam boiler backflow, ensuring repeatable pressure ramps, and preventing the group head from dripping after a shot—the primary signs that technicians look for when diagnosing a "failing espresso machine check valve." Maintain the legendary performance of your commercial lever machine and eliminate downtime by choosing this essential replacement part. Specifications include its exact dimensions and threading for perfect, leak-free compatibility with the lever group (consult your specific machine manual for proper fitment, often related to La Marzocco Leva models). Don't let a small component compromise your shot quality—replace your worn-out check valve to immediately fix "espresso machine pressure drops during pull" and "lever group head not sealing properly." Invest in the A.5.063 Bush Check Valve today for factory-level reliability and consistency.