One time use type OTU-6 rupture disc assembly. 1/2" MPT inlet & outlet, Brass body, (F)STD Disc Type, Nickel disc material, 0.69", disc size, Max temperature 750°F, Burst pressure: 250 PSIG @ 72°F. Range 10%. Oseco. ASME Stamped, Oxygen Cleaned Q06-484-C