One time use type OTU-32 rupture disc assembly. 3/4' MPT inlet & outlet, Brass body, (F)STD Disc Type, Nickel disc material, 0.69', disc size, Max temperature 750°F, Burst pressure: 250PSIG @ 72°F. 10% Burst Range, 0% Stamped. Oxygen Cleaned. ASME stamped. Oseco.