NCCER PLUMBING LEVEL 1 EXAM PREP
GUIDE 2026 CORE PLUMBING SKILLS AND
CONCEPTS AND SOLVED ITEMS
◉ In general, PVC pipes should be supported at a maximum intervals
of
Answer: 4 feet
◉ The most commonly used clamps used as vertical support for pipe
and tubing are
Answer: Pipe riser clamp
◉ To avoid possible damage to the pipes from freezing during sub
freezing temperatures, water should be blown out of the pipe lines
Answer: After testing
◉ Plumbers commonly us PR as tub because of its
Answer: strength, flexibility, and chemical-resistance properties
◉ Plumbers often use c-clamps to fasten pipe to
Answer: Metal structures
, ◉ PEX tubing resists high temperatures and chemicals, so it must be
joined by
Answer: using a crimp ring system
◉ Reaming is a process after cutting pipe to remove
Answer: Burrs
◉ All of the following are common valves used for water supply
system except
Answer: Butterfly valve
◉ Compared to other types of piping, copper tube and fittings are
generally
Answer: More expensive
◉ Tubes that are measured in nominal or standard sizing have an
OD that is
Answer: I/8" larger than nominal size
◉ Type K, L, M, and DWV copper tubing are measured using
Answer: Nominal sizing
◉ Type K copper tube is marked with the color code
GUIDE 2026 CORE PLUMBING SKILLS AND
CONCEPTS AND SOLVED ITEMS
◉ In general, PVC pipes should be supported at a maximum intervals
of
Answer: 4 feet
◉ The most commonly used clamps used as vertical support for pipe
and tubing are
Answer: Pipe riser clamp
◉ To avoid possible damage to the pipes from freezing during sub
freezing temperatures, water should be blown out of the pipe lines
Answer: After testing
◉ Plumbers commonly us PR as tub because of its
Answer: strength, flexibility, and chemical-resistance properties
◉ Plumbers often use c-clamps to fasten pipe to
Answer: Metal structures
, ◉ PEX tubing resists high temperatures and chemicals, so it must be
joined by
Answer: using a crimp ring system
◉ Reaming is a process after cutting pipe to remove
Answer: Burrs
◉ All of the following are common valves used for water supply
system except
Answer: Butterfly valve
◉ Compared to other types of piping, copper tube and fittings are
generally
Answer: More expensive
◉ Tubes that are measured in nominal or standard sizing have an
OD that is
Answer: I/8" larger than nominal size
◉ Type K, L, M, and DWV copper tubing are measured using
Answer: Nominal sizing
◉ Type K copper tube is marked with the color code
