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A gasket for a compressed gas cylinder arranged to operate with a gas cylinder having a neck with a top surface around a gas outlet and a side surface extending downwardly from the top surface. The gasket may include an upper portion arranged for positioning on the top surface of the cylinder and fo

A gasket for a compressed gas cylinder arranged to operate with a gas cylinder having a neck with a top surface around a gas outlet and a side surface extending downwardly from the top surface. The gasket may include an upper portion arranged for positioning on the top surface of the cylinder and for making a seal with the top surface, and a lower portion extending downwardly from the upper portion and around the side surface of the neck of the cylinder, such that the lower portion is arranged to make a seal with the side surface of the gas cylinder. Face and gland seals may be established by the gasket with an opening that receives the gasket and an associated cylinder neck.

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1. A gasket for a compressed gas cylinder having a neck with a top surface around a gas outlet and a side surface extending downwardly from the top surface, the gasket comprising: an upper portion including a radially extending portion that defines a face and is arranged for positioning on a top sur

1. A gasket for a compressed gas cylinder having a neck with a top surface around a gas outlet and a side surface extending downwardly from the top surface, the gasket comprising: an upper portion including a radially extending portion that defines a face and is arranged for positioning on a top surface of a compressed gas cylinder and for making a seal with the top surface;a lower portion extending downwardly from the upper portion and having a sidewall portion arranged to extend around a side surface of a neck of the cylinder, the sidewall portion of the lower portion being arranged to make a seal with the side surface; anda ring including a rigid material that extends around a part of the lower portion and is arranged to hold the gasket on the neck, the ring being configured to extend over a part of the sidewall portion below the top surface of the neck to compress the sidewall portion against the neck, and the ring being configured to extend above the top surface of the neck to support portions of the upper portion above the top surface against extrusion, the face of the upper portion being exposed and uncovered by the ring,wherein the radially extending portion of the upper portion is arranged to engage and form a gas-tight seal with the top surface of the compressed gas cylinder to resist gas leakage past the seal with a gas exiting a gas outlet of the gas cylinder at a pressure of 1000 to 3500 psi, andwherein the upper portion and the lower portion are formed as a single piece and are made of an elastomeric material having a durometer of 50 to 100 on the Shore A scale. 2. The gasket of claim 1, wherein the lower portion includes a continuous sidewall portion arranged to extend around the side surface of the neck of the cylinder and to form a seal with the side surface. 3. The gasket of claim 1, wherein the upper portion includes an upper opening near a center of the upper portion arranged for positioning over the gas outlet. 4. The gasket of claim 3, wherein the upper portion at the opening is arranged to engage with and make a seal with a piercing element used to pierce the gas outlet. 5. The gasket of claim 4, wherein the upper portion at the opening is arranged to form a gland seal with the piercing element. 6. The gasket of claim 1, wherein the lower portion is attached to and extends downwardly from an outer periphery of the upper portion. 7. The gasket of claim 1, wherein the lower portion has a cylindrical shell shape or a frustoconical shape. 8. The gasket of claim 1, wherein the upper and lower portions together form a cup-shaped interior space arranged to receive a part of the neck of the cylinder. 9. The gasket of claim 8, wherein the cup-shaped interior space is tapered to have a smaller size near the upper portion than near a bottom end of the lower portion. 10. The gasket of claim 1, further comprising a gas cylinder with the gasket attached to a neck of the gas cylinder. 11. An assembly including: a compressed gas cylinder having a neck with a top surface around a gas outlet and a side surface extending downwardly from the top surface, the gas cylinder containing a gas under a pressure of 1000 to 3500 psi that is releasable from the cylinder through the gas outlet; anda gasket attached to the neck of the gas cylinder, the gasket including: an upper portion including a radially extending portion that defines a face and is positioned on the top surface of the gas cylinder;a lower portion extending downwardly from the upper portion and having a sidewall portion arranged to extend around the side surface of the neck of the cylinder; anda ring including a rigid material that extends around a part of the lower portion and is arranged to hold the gasket on the neck, the ring being configured to extend over a part of the sidewall portion below the top surface of the neck to compress the sidewall portion against the neck, and the ring being configured to extend above the top surface of the neck to support portions of the upper portion above the top surface against extrusion, the face of the upper portion being exposed and uncovered by the ring,wherein the radially extending portion of the upper portion is arranged to engage and form a gas-tight seal with the top surface of the gas cylinder to resist gas leakage past the seal with a gas exiting the gas outlet at a pressure of 1000 to 3500 psi, andwherein the upper portion and the lower portion are formed as a single piece and are made of an elastomeric material having a durometer of 50 to 100 on the Shore A scale.