The Power Products 100' Roll GPT Primary Wire It is made with a tough thermoplastic insulation that resists acid, oil, and moisture, and meets or exceeds SAE J1128 and SAE J378 type GPT specifications. This 100' roll of 14-Gauge wire offers a wide variety of lengths to satisfy the diverse requirements of the automotive, marine, and trailer industries. With its superior quality and durability, it is the perfect choice for automotive, marine, and trailer industries. FleetPride is your First Click in Heavy Duty®.