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Constructed of injection molded polypropylene these collector boxes are designed to be used in conjunction with a louvered vent to facilitate air intake and exhaust. For use with either the 331200 or 331201 stainless louvered vents or 337210, 337211, or 337212 injection molded ABS louvered vents. Interchangeable with Attwood® part number's 1341 and 1342. 331203 can accept the 337600 3" collector box hose adapter.