RFD-9-144-76-27-A5 is a part manufactured by Essentra, a UK-based producer of plastic, rubber, and foam components for the medical, consumer, and industrial markets. The part is a type 9 rubber washer, with an inner diameter of 144mm (5.67"), an outer diameter of 76mm (2.99"), and a thickness of 27mm (1.06"). This washer is made from black neoprene rubber, with a hardness of 65 ±5 Shore A. It is designed to act as a sealant or cushion between two mating parts.