To protect the valves, portable cylinders use a what?

• A. Collar
• B. Cap
• C. Shield
• D. Chain

Answer: (A)

Valves on portable cylinders are delicate and can be damaged by a knock or drop. A collar around the neck acts as a built-in bumper, taking the impact and protecting the valve stem and connections. This keeps the valve safe during handling, storage, and transport because the protective ring remains with the cylinder and prevents direct damage to the valve. A cap can cover the valve, but it’s typically a removable cover used during transport and isn’t the permanent protection you rely on; a shield isn’t the standard term for valve protection, and a chain is used to secure the cylinder, not to protect the valve itself.