tank 1 which has collar 3 which surrounds gas valve 5 the collar is a structure that forms part of the tank and is not part of the present invention the collar may be integrally formed with the tank or it may be welded thereto a protective cover 7 usually made of plastic surrounds the valve and is removed or partially released from the valve when the tank is in use the cover 7 also does not form part of the present invention but is typically supplied with the tank in the drawings of this disclosure the cover is shown in the partially released condition in the embodiment of fig1 u2013 4 the safety device comprises two distinct pieces the first piece is a cross member 9 which is attached to cup 11 the second is a handle portion 13 which attaches to the cross member as described below and as illustrated for example in fig3 fig2 shows the cross member 9 as it is being inserted over the gas valve 5 the cross member includes l shaped portion 20 which fits through an opening defined by the collar 3 so as to engage the collar the cup 11 has a diameter and height sufficient to enclose a substantial portion and preferably the major.