Over-tightening fittings results in poor fluid connections and leaky processing. Click-N-Seal connection fittings eliminate this process variable by providing objective feedback that the required torque for a proper seal has been achieved, thereby preventing excess torque. During tightening, the connection clicks when the correct torque is reached. The installer can feel and hear the click, and is physically prevented from tightening beyond that point. This tactile and audible indicator enables hand tightening of fittings without tools or guesswork. The fitting can be unthreaded by simply turning it backwards for reuse.