Orion® T5 tank shall be cylindrical, seamless, stress and defect free, rotationally molded construction to uniform wall thickness from virgin PE resins conforming to ASTM D 1248, with single FNPT inlet with dip tube, outlet and vent as standard. All penetrations shall be heat fused to tank wall. Standard, non-load bearing, domed tank cover shall be bolted and gasketed to tank.