Ancor 22-18 Heatshrink Butt Connectors - 100-Pack [309099]22 18 Heatshrink Butt Connetors 100 Pack Guage Size: 22 18 Quantity: 100 Features: Cross Linked polyolefin tubing is much stronger than PVC tubing and will not burn like PVC. Heat activated adhesive lining provides impervious seal to salt water, oil, acids, and sunlight as well as providing strain relief. Nylon insulator, preferred by experts, for Marine Grade resistance to sunlight, water, oil, chemicals, vibration and cut through damage. UL Listed