This 15-1/2" collector box will fit Sea-Dog Line stainless steel, 8 slot louvered vents #s 331200 (standard) and 331201 (recessed).
It will also fit Sea-Dog Line 17-1/2" ABS, flat louvered ventilators #s 337210, 337210-1, 337211, 337211-1, and 337212.
It is interchangeable with Attwood® part# 1341
"Warning - this product contains chemicals, including Napthalene [C], known to the State of California to cause cancer or other reproductive harm - For more info go to www.P65Warnings.ca.gov"
www.P65Warnings.ca.gov