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    Pro Reference Trades Suite
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    Learning Paths

    Structured courses to build your expertise

    Certification track · spaced repetition

    EPA 608 Study Center

    Core + Type I, II, III practice for refrigerant-handling certification.

    Licensure track · spaced repetition

    NEC Journeyman Study Center

    Definitions, branch circuits, services & grounding, motors & special occupancies — journeyman electrical exam prep.

    Licensure track · spaced repetition

    Plumbing Journeyman Study Center

    Administration, water supply, drainage, vents & traps, fixtures & gas — IPC/UPC plumbing journeyman exam prep.

    Certification track · long-form worked problems

    Fire & Fabrication Study Guide

    NICET Level II & III water-based systems and CFPS life-safety / building-code enforcement — 6 essay-style problems with worked derivations.

    Curriculum track · sequential chapters

    Apprentice Learning

    Structured chapters covering the full plumbing apprentice curriculum — sequential lessons with section quizzes.

    Reference · technical diagrams

    Diagram Library

    Piping schematics, NEC wiring layouts, and HVAC system diagrams — zoom, print, or export as PNG/PDF.

    Plumbing Fundamentals

    Beginner

    Master the essential concepts every plumber needs to know

    4h total
    5 lessons

    Drainage Systems Mastery

    Intermediate

    Complete guide to drain and waste systems

    4h total
    2 lessons

    Repair Fundamentals

    Intermediate

    Essential repair skills for common plumbing issues

    5h total
    1 lessons