When working with GMP AirStream cable blowing machines, the Spare Tube Seal O Ring is an essential component that ensures proper functionality. This pack of five seals is designed to fit tube diameters ranging from 12 to 12.7 mm, providing a reliable and snug fit to maintain optimal performance. Ideal for anyone using cable blower equipment, these O rings are a necessary accessory to keep your machinery operating efficiently and to prevent potential leaks or failures during operation. With easy access and compatibility with various tube sizes, these O rings facilitate hassle-free maintenance for your cable placing equipment.