Pipefitters, sometimes simply called fitters, install and maintain pipes that carry chemicals, acids, and gases. These pipes are used mostly in manufacturing, commercial, and industrial settings. Fitters install and repair pipe systems in power plants, as well as heating and cooling systems in large office buildings. Some pipefitters specialize as gasfitters, sprinklerfitters, or steamfitters.
If your bathroom sink is slowly draining instead of holding water, your problem is super easy to fix. You likely just need to make a quick adjustment to the assembly under the sink. Pop-up drains have an arm that reaches down the drain and connects to a little rod. That rod sticks through the drain pipe and is held in place by a metal strip with holes in it. That strip, in turn, is connected to the little lever or handle you pull on to open and close the stopper. The video above from HomeAdditionPlus has an excellent look at how to make adjustments.
Plumbers in Australia have licensing requirements that differ from state to state but it is generally accepted a 4-year apprenticeship with a further minimum experience of 2 years (6 years total) and a further curricular requirement as a benchmark for licensing. Licensed plumbers are also expected to maintain minimum relevant training requirements to maintain their plumbing license