100% Silicone-based sealant protects against moisture and corrosion. UL Listed to 486G Sealed Twist-on Wire Connector. Easy to apply, pre-filled twist-on wire connectors. Swept wing design is built for comfort and efficiency. Eliminates the need for heat-shrink or excessive taping. Tough, UL 94V-2 flame-retardant shell rated at 105°C (221°F). Models 61 and 63 approved for bonding and grounding applications.