The Reinz O-Ring - 407339100 is a sealing ring designed to fit specific automotive engines. It is made of high-quality materials and is designed to provide a tight and secure seal to prevent leaks and maintain proper pressure within the engine. This O-ring is durable and reliable, making it a popular choice for engine maintenance and repairs. It is designed to meet or exceed OEM specifications, ensuring a perfect fit and performance. This O-ring is suitable for a variety of engine models and is an essential component for ensuring the proper functioning of the engine.