This product is a genuine Porsche A/C line O-ring designed for use on the front of Porsche models 911 and 928. The part number for this O-ring is 99970753441. It is used as a seal for the air conditioning system and is an essential component for proper functioning of the A/C system. This O-ring is made with high-quality materials and is manufactured to meet the specifications of Porsche vehicles. It is recommended to use this genuine Porsche O-ring for optimal performance and longevity of the A/C system.