Tough, lightweight, dielectric thermoplastic bodies withstand chemicals and perform effectively in extreme temperatures (-47? C to 177? C]. Surrounds the valve operating handle to protect against accidental valve operation. Unique, rotating design allows for easier installation in confined space applications.Centre knockout can be removed for rising stem gate valves. Each size rotates into itself and nests within the next larger size to save space in storage.Multiple workers can apply their personal safety locks. Complete with high-visibility permanent safety labels (English, French & Spanish) that can be written-on to identify the responsible person, then erased for the next job.