What should firefighters check for on an SCBA cylinder before it is filled?

Before refilling an SCBA (Self-Contained Breathing Apparatus) cylinder, it is crucial for firefighters to check for a current hydrostatic test date. This test is essential for ensuring the cylinder's integrity and safety, as it assesses whether the cylinder can withstand pressures beyond its normal operating levels. The hydrostatic test date indicates when the cylinder was last tested, and if the date is not current, it suggests that the cylinder may not be reliable for safe use.

This check is vital because using a cylinder that has not passed the required testing could pose serious hazards, including the potential for catastrophic failure under pressure. Regular hydrostatic testing is mandated to ensure that SCBA cylinders remain safe and functional throughout their service life, complying with safety regulations and standards set forth by organizations like the NFPA.