This is a TE Connectivity heat-shrink cable joint from their adhesive-lined sleeving product line. It provides strain relief and environmental sealing for single-breakout cable connections with fluid-resistant properties across -75°C to +150°C. Critical verification: confirm the 17mm primary/secondary ID matches your cable jacket OD pre-shrink and that the 6.9mm/3mm post-shrink diameters accommodate your termination hardware.