ARO Y325-126 O-Ring is the large Buna-N nitrile seal used in Ingersoll Rand/ARO diaphragm pump service kits for 1" and larger models. It measures 3/32" (0.09375") cross-section with a 1-9/16" (39.7 mm) outer diameter and comes in black. This O-ring seals between pump components to prevent air and fluid leaks during operation and is listed as the large O-ring in ARO service manuals, with compatibility including Mfr. model 650718-C and the 66615X-X-C series, commonly used in oil transfer and delivery system applications.
