Rectangular Sealing Ring 1.500 in I.D. x 0.1 in C/S x 0.11 in Thick 38.1 mm I.D. x 2.54 mm C/S x 2.794 mm Thick Viton (75) Light Blue Teflon Coat Part number: 121392 OE MFG: CUMMINS OEM Reference: 3101215 Cross Reference: CUMMINS : 3101215 | INTERSTATE-MCBEE : M-3101215 Product Class: Air Compressors & Parts The PAI 121392 is a rectangular sealing ring associated with Cummins OEM reference 3101215. Its listed dimensions are 1.500-inch (38.1 mm) inside diameter, 0.1-inch (2.54 mm) cross-section, and 0.11-inch (2.794 mm) thickness, providing key measurements for matching heavy duty diesel truck parts. The supplied description specifies Viton with a light blue Teflon coat. As a component type, a rectangular sealing ring forms a controlled barrier between mating surfaces to help retain pressure or fluids within the served system.