This Collet Duct Seal from GMP Tools is designed specifically for use with 1.25" SDR 11 duct systems, ensuring a secure and reliable fit. With its robust construction and precision engineering, the component effectively protects cables and maintains integrity during the cable placing process. Sold individually under part number 89038, this duct seal is an essential accessory for any comprehensive cable blower toolkit, optimizing performance and enhancing safety in cable management applications.