OCAL-BLUE™ Double-coat and stainless steel knockout hub. Captive sealing ring won’t buckle or slip during installation and provides a complete 360° seal even when conduit isn’t perpendicular to the enclosure. Hexagonal/splined body and locknut enables fast and easy installation. Insulated throat moulded from 105°C-rated thermoplastic, UL94V0 flammability rated. Pressure-sealing sleeves protect your connections. Sharper and deeper teeth provide a more penetrating bite for improved bonding to the enclosure.