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These horseshoe-shaped clamps are used to connect CG-138 flat O-ring flanges. The design allows the clamp to be installed or removed easily by twisting three adjustable tension locking screws. Clamps are made of cast aluminum with chemically-resistant green epoxy coating. Available in 32 mm, 57 mm, 80 mm, 4.5", and 5.5" flange size.