Features outward/inward rotation for easier installation and storage. Surrounds the gate valve operating handle to protect against accidental valve opening. Each size rotates into itself and nests within the next larger size to save space in storage. Multiple workers can apply personal safety padlocks. Lightweight, dielectric thermoplastic bodies withstand chemicals and perform effectively in extreme conditions (-40° F to 200° F). Complete with high-visibility permanent safety labels (English, French and Spanish) that can be written on to identify the responsible person, then erased for the next job.