The Elring O-Ring - 278386 is a small, circular rubber ring used for sealing purposes. It is made of high-quality materials and designed to fit snugly into the designated space, creating a tight seal to prevent leaks and maintain pressure. This particular O-ring has a part number of 278386 and is manufactured by Elring, a reputable company known for producing reliable sealing solutions. It can be used in a variety of industries and applications, including automotive, aerospace, and industrial machinery. The Elring O-Ring - 278386 is a durable and cost-effective solution for ensuring a secure and leak-free connection.