The Peterbilt 357, 375, 377, and 379 Heavy Duty Windshield Washer Fluid Reservoir is a reliable and practical solution for your vehicle. Made with durable plastic construction material, this direct replacement reservoir ensures a trouble-free installation. The complete assembly includes both the reservoir and reservoir cap, providing convenience and ease. Designed to withstand excessive heat and vibration, this reservoir guarantees reliable performance. Compatible with most Peterbilt models from 1989 to 2007, including the 357, 375, 377, and 379, it is a direct OE replacement with the Paccar R86-6001 number.