Patent ID: 7418974

Claim:
A tap for a gas, liquefied gas or other fluid vessel, comprising: a tap body having a main body portion and a base end portion provided with a first external thread for securing the tap to a neck opening of the vessel and a second external thread between the first thread and the main body portion; and a clamping ring having an internal thread which is in threaded engagement with the second thread, said clamping ring being adapted to be firmly tightened by the application of a predetermined torque thereto against the neck of the gas vessel about said neck opening so as to maintain the integrity and the tightness of the threaded engagement between the base end portion and the neck of the gas vessel in case of application of a strong impact force to the tap body; wherein said tap body has a weakening circumferential groove judiciously placed with respect to the threaded engagement of the clamping ring with the base end portion; and wherein the weakening circumferential groove is provided between the base portion and the main portion of the tap body, approximately at the end of the clamping ring facing towards the main portion of the tap body.