PC Cheat Sheet 2026

The 30 highest-yield PC facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. Which safety practice is essential for preventing cross-contamination in Plumber Certification? → Proper hand hygiene and equipment sanitation
2. What does the 'wet vent' system allow that traditional individual venting does not? → A drain pipe to also serve as the vent for an upstream fixture
3. When drilling holes through metal studs for pipe runs, which bit is recommended? → Step bit (unibit)
4. Which type of eye protection is required when using a power drain snake or auger? → Safety glasses with side shields rated ANSI Z87.1
5. An inspector notices a P-trap arm that exceeds the maximum developed length before venting. What violation does this represent? → Trap seal loss due to self-siphoning
6. When installing a dishwasher drain, where must the drain hose be routed before connecting to the disposal or drain? → Through a high loop or air gap at the underside of the countertop
7. A press tool (e.g., ProPress) creates watertight connections on copper or stainless tubing by: → Mechanically compressing a fitting with an o-ring using hydraulic jaw force
8. On a plumbing site plan, contour lines that are close together indicate what about the terrain? → Steep grade or slope
9. What is the importance of staying current with trends in Material Selection & Properties for Plumber Certification? → It ensures practices remain effective and relevant
10. What condition causes PVC pipe to expand and potentially crack if installed without expansion loops or offsets in long horizontal runs? → Thermal expansion
11. Which plastic piping material is rated for both hot and cold water and is commonly color-coded red and blue? → PEX
12. Which approach best supports quality outcomes in Preventive Maintenance Procedures for Plumber Certification? → Systematic application of evidence-based methods
13. How should a plumber properly dispose of water flushed from a water heater during preventive maintenance that contains high levels of sediment? → Route to a sanitary sewer drain in accordance with local codes
14. In a multi-story building, a plumber installs a stack that carries both soil and waste. What type of stack is this called? → Soil and waste stack
15. What is the maximum allowable level of lead in drinking water at the consumer's tap under EPA action level guidelines? → 15 ppb
16. A plumber is working on a well system and notices diesel fuel contamination in the soil near the casing. What is the correct response? → Stop work and report to the state environmental agency
17. When making a repair to a leaking galvanized steel pipe, which fitting allows you to remove a section of pipe without turning the entire run? → Union
18. What information is typically found in the title block of a plumbing blueprint? → Project name, date, scale, and revision history
19. On a blueprint, what does 'TYP' written next to a dimension or detail mean? → Typical — applies to all similar conditions
20. When cutting cast iron pipe with a snap cutter (soil pipe cutter), the chain should be: → Tightly wrapped perpendicular to the pipe centerline
21. When installing ABS plastic drain pipe, which solvent cement must be used? → ABS-specific black solvent cement
22. Which skill is most important for success in Installation Techniques within Plumber Certification? → Continuous learning and adaptation
23. In a multi-story building, where must a relief vent be installed relative to a circuit vent system? → Between the circuit vent and the soil stack
24. When connecting a gas dryer to a flexible gas connector, what is the maximum allowable length of the connector? → 6 feet
25. When installing a kitchen faucet, what is the purpose of applying plumber's putty under the faucet base? → To create a watertight seal between the faucet base and the sink deck
26. Which tool best detects a pinhole leak inside a wall without destructive opening? → Acoustic leak detector
27. A cleanout plug is removed to diagnose a drain blockage. Sewage immediately backs up out of the cleanout opening. This indicates the blockage is located: → Downstream of the cleanout toward the municipal sewer
28. Which method is commonly used to prevent clogging in drainage pipes? → Using drain screens and regular maintenance
29. On a plumbing drawing, a pipe with diagonal hatch marks drawn along its length typically indicates what? → An insulated pipe
30. What is the correct procedure for disposing of lead solder or lead-containing materials removed during repiping work? → Collect separately and dispose of as hazardous waste per EPA and local regulations