Plumbers have a strong mathematical background used
for finding angles, calculating simple and rolling offsets,
and offsets on parallel runs of pipe. They know
applications and properties of plastic, copper, cast iron,
and carbon steel pipes and fittings. They can identify
uses, installation and testing of corrugated stainlesssteel tubing, DWV piping, hangers, supports, structural
penetrations, fire stopping, fixtures, faucets, drains,
water heaters, backflow preventers, water pressure
boosters, recirculation systems, sewage pumps, and
sump pumps. Plumbers also have knowledge of basic
rigging, safety, and business principles.