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Comments about Professional Mariner Shaft Brush:
Boat is in salt water year round. Was losing prop shaft zincs in 2 to 3 months even after line isolation and rewire to ABYC standards. Installed this near the flex coupler contacting the shaft, routed 8ga wire to the stern, out one of the vents and connected it to a grouper zinc I hang in the water when docked. Zincs last 14-18+ months now and grouper has lasted 4 years w/o any appreciable loss.