Patented design and ultra-tough polypropylene material make these devices a great choice to assuredly lock out ball valves. Lockout devices lock out pipes 1/2 in to 2 1/2 in diameter and can lock valves open on pipes from 1/2 in to 1 1/4 in diameter. Ultra-tough polypropylene resists temperatures from (-18° to 79°C). Proper lockout tools and warning devices can save lives, reduce lost employee time and cut insurance costs.