The Diversitech 623-004 Yellow Screw-On Wire Nut is a must-have tool for any diver. This wire nut is made of durable plastic and is designed to securely fasten wires to a divers' gear. The screw-on design makes it easy to tighten and loosen, and the yellow color makes it easy to identify in a crowded dive area. The Diversitech 623-004 Yellow Screw-On Wire Nut is a must-have tool for any diver. This wire nut is made of durable plastic and is designed to securely fasten wires to a divers' gear. The screw-on design makes it easy to tighten and loosen, and the yellow color makes it easy to identify in a crowded dive area.