This 10 mm cable blower insert from GMP Tools, vendor part 32284, carries a bright zinc-plated (BZP) finish for corrosion protection in field service. The insert seats in the blower head to size the passage for 10 mm duct or cable, maintaining the air seal that drives fiber optic cable down the duct. BZP plating suits jobsite exposure and duct lubricant contact better than bare steel while keeping the part dimensionally precise. Ordered as a wear replacement by broadband and telecom installation crews. Millennium part #554492.