Patented design and ultra-tough polypropylene material make these devices the best choice to assuredly lock out your ball valves. Large Ball Valve Lockout Device locks out pipes 2 in. to 8 in. in diameter. Small Ball Valve Lockout Device locks out pipes 1/2" to 2-1/2" in diameter and can lock values OPEN on pipes from 1/2" to 1-1/4" in diameter. Ultra-tough polypropylene resists temperatures from 0° to 175°F (-18° to 79°C). Equipping your employees with the proper lockout tools and warning devices can save lives, reduce lost employee time, and cut insurance costs. Brady® is a world leader in lockout/tagout products and services offering industry expertise and a broad range of durable, easy-to-use lockout devices.