The 202D921-4/42-0 is a straight, lipped boot designed to provide strain relief when used with circular connectors and appropriate backshell adapters. Constructed from flexible polyolefin (material code -4), this boot is supplied with a /42 adhesive precoating for environmental sealing. As supplied, its major and minor entry diameters are 19.3 mm and 6.3 mm, respectively. After unrestricted heat recovery, these diameters shrink to a maximum of 4.5 mm and 2.1 mm, with a final recovered length of 60.2 mm. This boot is particularly useful for applications with a high ratio between the adapter and cable diameters, ensuring a secure and reliable connection.