A rotatable valve protector for a compressed gas cylinder having a neck to which a valve is attached. The valve protector comprises a rigid, hollow, open-ended, generally frustoconical element having large lateral openings affording access to the valve and enabling the use of the protector as a handle...http://www.google.fr/patents/US4332331?utm_source=gb-gplus-shareBrevet US4332331 - Rotatable valve protector for compressed gas cylinder
Rotatable valve protector for compressed gas cylinder
