Home Expansion Joints Series 440 Molded PTFE Convoluted Expansion Joints 6 Products Style 442-BD Two Convolutions Designed for Minimal Movements Style 443-BD Three Convolutions Designed for Moderate Movement Style 445-BD Five Convolutions Designed for Maximum Movements Style 442-BE Two Convolutions Designed for Minimal Movements w/Style 440-BD Limit Bolts Style 443-BE Three Convolutions Designed for Moderate Movements w/Style 440-BD Limit Bolts Style 445-BE Five Convolutions Designed for Maximum Movements w/Style 440-BD Limit Bolts