75 which includes a grip portion 77 is attached to the cross member such as by welding alternatively the handle could be attached to the cross member by other means or it could be integrally formed with the cross member one end of the cross member comprises a c shaped structure 77 suitable for engagement with collar 79 of propane tank 81 by passing through the opening in the collar the other end 83 of the cross member is l shaped and includes hole 85 which accommodates the shank of padlock 87 thus the cross member includes means for engaging the collar at diametrically opposed locations the lock is preferably attached such that the shank passes through hole 85 and also through the opening in the collar while still enclosing a portion of the collar in this way the l shaped end of the cross member is locked to the collar and the cup cannot move access to the valve is therefore blocked fig8 and 9 illustrate yet another embodiment of the present invention this embodiment does not include a handle but still prevents access to the valve of the propane tank the device includes u shaped member 91 and cup 93 as before the cup fits over the valve of the tank in this embodiment the cup includes openings such as opening 95 which allow the prongs of the u shaped member to slide through the cup the u shaped member.