A professional who tends equipment to fill cylinders and other containers with liquefied or compressed gases. Respnsibilities include:

• Changes cylinder valves with wrench, or adjusts them to prescribed tension, using torque wrench.
• Rolls cylinders onto platform scale, or positions cylinders in manifold racks manually or with chain hoist.
• Connects lines from manifold to cylinders, using wrench.
• Fills cylinders by any of following methods.:
• (1) Sets pressure gauge to specified reading and listens for buzzer indicating completion of filling.
• (2) Adjusts valves and observes gauge to fill cylinders to specified pressure.
• (3) Observes scale indicator to fill cylinders to specified weight.
• (4) Fills cylinder to excess, rolls cylinder onto scale, and connects exhaust line to release excess gas and attain prescribed gross weight.

• Sprays or brushes chemical solution onto cylinder valve to test for leaks.
• Fills out and attaches warning and identification tags or decals, specifying tare and gross weight, cylinder number, type of gas, and date filled, and records data.
• May test gas for purity, using burette or other testing equipment.
• May inspect or test empty cylinder.
• May evacuate residual gases from cylinders.
• May test filled cylinders for specified gas pressure by connecting gauge and comparing reading with chart.
• May tend and maintain generator or compressor in filling process.
• May be designated according to type of container filled as ton-container filler; tube-trailer filler.