A-Premium Power Steering Reservoir with Cap — Direct-Fit OEM-Style for Toyota & Lexus, Heat-Resistant

The A-Premium Power Steering Reservoir with Cap is a direct-fit replacement reservoir designed to restore proper fluid containment and steering performance on compatible Toyota and Lexus models.

This replacement power steering tank is engineered as a robust, OEM-style unit to replace worn, cracked, or leaking reservoirs. Constructed from high-temperature, pressure-resistant plastic, it mirrors original equipment dimensions and mounting points so installation is straightforward for DIYers and professional technicians alike. The unit ships complete with a cap and matches the fitment and function for multiple Toyota and Lexus model years.

Which vehicles will this A-Premium reservoir fit?

This reservoir is built to fit a range of Toyota and Lexus vehicles where the original part numbers match. It covers common passenger cars and mid-size sedans from the early 2000s through the 2010s, ensuring wide compatibility for owners needing an exact-style replacement.

• Toyota Avalon: 2005–2012
• Toyota Camry: 2002–2011 (2007 Camry except Hybrid)
• Toyota Solara: 2004–2008
• Lexus ES300/ES330/ES350: 2002–2012 model coverage (varies by year)

How durable and reliable is the replacement tank?

The tank is molded from solid plastic formulated to withstand engine-bay heat and hydraulic system pressures without deforming. Materials and construction are selected to provide leak resistance and long-term dimensional stability under normal operating conditions.

• High-temperature plastic resists softening and warping
• Pressure-capable design prevents bulging under load
• Manufactured to maintain correct mounting and hose connection alignment

What makes this an easy replacement for my vehicle?

A-Premium supplies the reservoir in the same overall shape and with the same cap interface as the factory unit, which minimizes modification during swap-out. It’s intended to fit existing brackets and hoses so labor time is reduced compared with universal or non-matching aftermarket tanks.

• Direct-fit dimensions for hassle-free installation
• Includes matching cap compatible with factory sealing surfaces
• Replaces common OEM reference numbers for straightforward cross-referencing

Which part numbers and references correspond to this reservoir?

The reservoir is listed to match several OEM reference numbers so you can confirm compatibility with parts catalogs or dealer information. Using the correct reference helps ensure you order a unit that aligns with your vehicle’s original configuration.

• Reference numbers: 603-670, 603670
• OEM cross-refs: 4436006030, 4430506030, 4430506050
• Additional cross-refs: 4430528030, 4430528060, 4430528061, 44360330, 40603670

If you’re replacing a cracked, leaking, or otherwise failed power steering reservoir, this A-Premium unit provides a solid match to factory form and function. It arrives ready to install with the correct cap interface and is manufactured to resist the heat and pressures commonly found in the power steering circuit.

Who is this for? Owners and mechanics who need a dependable, direct-replacement power steering tank for Toyota Avalon, Camry, Solara and compatible Lexus ES models will benefit most. It’s suitable for automotive DIYers familiar with basic fluid-system service, as well as professional shops that require a consistent aftermarket alternative to OEM reservoirs. A-Premium backs the part with a one-year unlimited-mileage guarantee for added confidence in everyday driving applications.