Thru-Hull Connections Are Cast Bronze. Flange Is Machined To Fit Hull And Grooved To Retain Bedding Compound. Neck Is Threaded To Approximately 3/8" From Flange. With Flange Nut. Pipe Size And Maximum Hull Thickness Given. Size": 1/2 Hull": 1-3/8 Flange": 1-1/2
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