That flexibility gives you a much better seal overall, and invaluable peace of mind. A coupling in a metal sleeve with band clamps that can be tightened to seal pipe joints. Though a mission coupling ...

When a copper pipe corrodes and leaks or bursts from freezing, you have to fix it fast. If the leak is pinhole-sized and less ...

Rigid couplings include sleeve or muff couplings which generally clamp to the shafts with grub screws and which may have a keyway machined into the bore for better torque transmission. Lovejoy jaw ...