One time use type OTU-6 rupture disc assembly. 1/2" MPT inlet & outlet, Brass body, (F)STDV Disc Type, Nickel disc material, 0.69", disc size, Max temperature 750°F, Burst pressure: 525 PSIG @ 72°F. 0% Stamped Range. Oxygen Cleaned and ASME Stamped. Oseco.