HELP™ Power Steering Reservoir Cap by Dorman®. Location: Pump Mounted Reservoir. Quantity: 1 per Pack. Dorman offers a variety of Power Steering Reservoir Caps for a range of applications. All Power Steering Reservoir Caps are constructed of high-quality material for long-lasting durability. If you’re striving to restore smooth and predictable steering of your vehicle, this high-quality replacement steering part is just the ticket. It is manufactured from durable and long-lasting materials so you can count on proper steering at all times.