🔍 Key Concepts

• Review 46 CFR Subchapter F sections for fuel oil systems and diesel fuel system design • Look for language about drain cocks, valves, and plugs used to remove water or impurities from fuel tanks or lines • Consider how regulations balance safety (fire risk, leakage) with practical operation and maintenance

💭 Think About

• Ask yourself: Does the regulation completely forbid such valves, require them, or allow them only under certain safety conditions? • Compare the choices that describe conditional permission (allowed if fitted a certain way) versus those that describe a complete requirement or complete prohibition. • Think about the fire and pollution risk: If a valve can accidentally be left open, what does the regulation likely require to minimize that risk?

✅ Before You Answer

• Locate the exact wording in 46 CFR Subchapter F about valves used to drain water or impurities from diesel fuel oil systems. • Check whether the text uses phrases like "shall be fitted" (required), "may be fitted" (permitted), or "must not be fitted" (prohibited). • Verify any required protective fittings (such as caps, plugs, or similar closures) that must be installed if such valves are allowed.