The AllPoints Foodservice Parts & Supplies 8009937 O-Ring is designed for use in frozen drink machines. With an outer diameter of 5 inches and an inner diameter of 4-3/4 inches, this rubber O-ring is 1/8 inch thick, ensuring a secure fit for optimal performance. Its durable black rubber construction provides reliable sealing, making it an essential replacement part for SaniServ model 58911. Enhance the efficiency of your frozen drink machine with this high-quality O-ring.