The AllPoints Foodservice Parts & Supplies 321677 is a durable filter coupling O-ring designed for fryers. With an outer diameter of 13/16" and an inner diameter of 5/8", this black rubber O-ring ensures a secure and reliable seal. It serves as a direct replacement for the Pitco PP10409, making it an ideal choice for maintaining optimal fryer performance. Its robust construction provides longevity and resistance to wear, ensuring efficient filtration and operation in your foodservice equipment.