A-Premium Universal Coolant Reservoir Tank Bottle — Compact Non-Pressurized Overflow with Vented Twist Cap (Black, 194×166×105mm)

A-Premium's Universal Coolant Reservoir Tank Bottle with vented cap is a non-pressurized, durable replacement overflow reservoir designed to hold and recover engine coolant in a wide range of vehicles and custom applications.

This compact recovery tank (reference 603-001) is molded from heat‑resistant plastic and includes a spring-loaded twist vent cap plus three mounting holes for flexible installation. It does not rely on pressurization and fits many applications where a reliable overflow or expansion reservoir is required — from repair projects to custom cooling system builds.

How will this reservoir work in my vehicle or custom cooling system?

The A-Premium reservoir functions as a non-pressurized expansion and recovery tank that accepts overflow coolant as the engine heats and returns fluid to the system as it cools. Because it’s universal rather than vehicle-specific, it’s suited for repairs, aftermarket conversions, and performance or vintage applications where OEM tanks are unavailable.

• Non-pressurized design for simple overflow and recovery.
• Vented, spring-loaded twist cap for controlled venting and topping off.
• Three pre-formed mounting holes for adaptable placement.
• Compact footprint (194 mm H × 166 mm L × 105 mm W) for tight engine bays.

What materials and durability features should I expect?

Constructed from high-quality polyamide (PA) plastic, the tank resists heat, vibration and typical under-hood conditions. The material selection helps maintain structural integrity over time and reduces the risk of cracks or leaks in aggressive thermal cycles.

• Heat- and vibration-resistant plastic construction.
• Factory-manufactured to consistent quality-control standards.
• Designed to limit coolant contamination and minimize system wear.

How easy is installation and everyday use?

The universal form factor and three mounting holes let you adapt mounting orientation for many engine bays or custom frames. Plumbing is straightforward: connect the radiator or heater hoses to the inlet/outlet, secure the tank with bolts through the mounting holes, and use the included vented cap for safe filling and pressure relief.

• Three mounting holes for multiple orientation options.
• Includes a vented, spring-loaded twist cap for simple filling and venting.
• Compact dimensions fit crowded engine compartments and retrofits.

What performance or maintenance benefits does it provide?

Using a stable, high-quality reservoir helps maintain coolant levels, reduce oil dilution and limit system contamination that can accelerate component wear. While not a performance part by itself, a reliable recovery tank supports proper cooling system operation and can help the whole system run cleaner and longer.

• Helps stabilize coolant levels and reduces air intrusion.
• May help limit oil dilution and excessive wear associated with cooling issues.
• Backed by A-Premium’s one-year unlimited-mileage guarantee for added confidence.

Who is this for: The A-Premium Universal Coolant Reservoir Tank is ideal for DIY mechanics, restoration projects, aftermarket customizers and anyone replacing a damaged overflow tank where a direct OEM match is unavailable. It suits daily drivers, classic cars, race-prep builds and any application needing a compact, durable, non-pressurized coolant recovery reservoir with flexible mounting and a vented cap.