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 ...

A coupling in a metal sleeve with band clamps that can be tightened to seal pipe joints. Though a mission coupling costs more than a plastic coupling, it's worth it. Sometimes pros will even use ...

You can buy a sweat coupling sized to repair 1/2-in. or 3/4-in. copper pipe. Cut the repair sleeve from the 12-in. repair ...