Skip to main content
    Pro Reference Trades Suite
    Sign InCreate accountAdminUpgrade
    Back to glossary

    Core Concepts and Principles · Pressure and Flow

    Back Pressure

    The pressure that resists fluid flow in a plumbing system, often caused by restrictions or backflow conditions. Typical residential range: 40-80 PSI (pounds per square inch). Optimal: 50-60 PSI.

    Safety note

    ⚠️ SAFETY: Always shut off water supply and relieve pressure before working on pressure systems. Wear safety glasses and gloves.

    Pro launch updates

    Get notified when Pro launches, plus a monthly code-change digest. Email only — no account required.