Airmar 75WR-4 Transducer Housing Wrench75WR 4 Transducer Housing Wrench A single handed wrench that holds the main thru hull housing via the 'wrench flats' on the side of the housing to facilitate tightening of the hull nut. Use wrench 75WR 2 or 75WR 3 for the hull nut. For use with: B75 SS75
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