Provides Rain-Tight Seal When Fastening Threaded Conduit to Threadless Opening in Box or Enclosure | Crimp-Free, Solderless Push-in Butt Splice. Slim Design Fits Through 1/2 In. Knockout. Faster Alternative to Traditional Butt Splices. Transparent Polycarbonate Window for Visual Inspection of Connection | Reinforced Rib & Holes for Extra Strength, Snap-on Feature