A safety vent (10) for a railroad tank car has a housing (12) mounted about anopening on the top of the car. The housing bodydefines a cavity which contains a surge protector (16) and a rupture disk(18). The rupture disk (18) is designed to open at a know pressureand allow controlled venting of the pressure in the car. A securement cap (20)threaded into the cavity centers the rupture disk (18) in aseat formed in the surge protector (16). Removal of the securement cap (20)provides quick, easy access to the rupture disk (18) and surgeprotector (16) for inspection and replacement without removing the housingbody.
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