Incorporating O-ring for additional sealing, Dual Sealing AFO Plug vents air from product when filling it with hydraulic oil or to release trapped high-pressure gas. Removable and reusable plug, manufactured from corrosion-resistant Types 303 and 15-5 SS, has self-aligning floating seal. Plug has 2-piece construction and withstands pressures up to 56,000 psi as well as temperatures to 600°F.