Same day service (in most cases) on PSI/PCI SCUBA cylinder visual inspections at NO ADDITIONAL CHARGE. Graveyard Diver has the fastest turn around time for PSI/PCI SCUBA Cylinder visual inspections on the Crystal Coast. SCUBA Cylinder Tumbling SCUBA Cylinder/Valve Oxygen Cleaning SCUBA Cylinder hydrostatic testing SCUBA Cylinder valve service By a PSI/PCI trained inspector. eMail to schedule a time for your PSI Scuba Cylinder visual inspection, Scuba valve service,  Scuba cylinder oxygen cleaning, or Scuba cylinder hydrostatic test.