This genuine HARDI JE20AA7131 shim set is an original equipment manufacturer (OEM) part designed for use in various HARDI diaphragm pumps. It is specifically compatible with HARDI pump models 363, 364, 463, 464, 563, and 564. This shim set is crucial for maintaining correct clearances and ensuring the precise spacing of internal components within the pump assembly, which is vital for the pump's efficient operation and longevity. Manufactured to HARDI's exacting specifications, this part guarantees reliable performance and a perfect fit.