The AllPoints Foodservice Parts & Supplies 321419 O-ring is designed for use in dishwashers, specifically for drain and overflow tubes. With an outer diameter of 1-3/4 inches and an inner diameter of 1-5/16 inches, this durable black rubber O-ring ensures a secure and leak-proof seal. Its robust construction provides reliable performance, making it an essential component for maintaining optimal dishwasher functionality.