Supply tank for inflammable gas with protective cap

A refillable supply tank for an inflammable gas comprising:

• a tank body defining a container with a wall surrounding a hollow interior for receiving the gas and an opening in the wall;
• a valve support component mounted in the opening and defining a passage therethrough extending from an end face of the valve support component into the interior of the tank body;
• a valve body in the passage arranged to provide a primary seal of the passage against escape of the gas and operable to open the passage to allow the escape when required;
• and a valve protection cap for covering the valve support component with the valve body therein;
• the valve protection cap including an upper wall and at least one depending peripheral wall which extends around the valve support component;
• wherein the upper wall of the valve protection cap includes an elongate projecting pin member projecting from the upper wall of the valve protection cap to a remote end of the projecting pin member spaced from the upper wall;
• wherein the projecting pin member extends into and engages into the passage to provide a secondary seal with the passage to supplement the primary seal of the valve body in the passage;
• wherein the projecting pin member is defined by an annular sleeve surrounding a hollow interior where the hollow interior of the sleeve extends along the projecting pin member from the remote end of the projecting pin member to the upper wall;
• and
• wherein the annular sleeve has an outside surface extending from the upper wall to the remote end which outside surface tapers from the upper wall to the remote end so that a diameter of the outer surface at the upper wall is greater than a diameter of the outer surface at the remote end and wherein the annular sleeve has an inside surface surrounding the hollow interior extending from the upper wall to the remote end which inside surface tapers from the remote end to the upper wall to so that a diameter of the inside surface at the upper wall is less than a diameter of the inside surface at the remote end.