RYANSTAR RACING 800ml Billet Aluminium Coolant Expansion Tank — Anodized Black, TIG-Welded, Pressure-Cap Compatible

RYANSTAR RACING's 800ml billet aluminum coolant expansion tank is a compact, durable overflow reservoir that replaces plastic bottles to protect your cooling system and manage coolant flow under pressure.

This universal 800ml coolant expansion tank is machined from 6061 aluminum, anodized black for corrosion resistance, and fitted with a pressure-cap-compatible neck and O-ring seal to reduce leaks and extend service life. It’s designed to work with standard radiator cap systems and to stand up to wider temperature ranges than stock plastic tanks, helping maintain proper coolant volume, reduce oxidation inside the cooling loop, and return coolant to the radiator as temperatures normalize.

How does this aluminum expansion tank improve cooling-system reliability?

The billet aluminum construction resists cracking, swelling and chemical breakdown that commonly affect plastic tanks over time. A fully TIG-welded body and sealed cap area reduce the risk of coolant loss while the anodized finish helps prevent surface corrosion in road and track conditions.

• 6061-T6 aluminum body for greater mechanical strength than plastic
• Durable anodized black finish that resists oxidation
• Fully TIG-welded seams and thread with O-ring for a tight seal
• Designed to accept standard radiator pressure caps

Will this tank work with my vehicle and radiator cap?

The RYANSTAR RACING tank is a universal-style overflow reservoir intended to pair with most aftermarket and many OEM radiator cap systems. Check the cap diameter and hose fittings on your vehicle to ensure compatibility before ordering.

• 800ml capacity suits many street and light-performance applications
• Standard threaded filler neck accepts common pressure caps
• Hose fittings designed for typical radiator overflow hoses
• Temperature-rated hose material works across a broad range (-30°C to 120°C)

How does the tank handle pressure and temperature changes?

This overflow reservoir manages coolant expansion and contraction by temporarily storing excess fluid when the system is hot and returning it when the system cools. The tank’s materials and fittings are specified to endure normal operating pressures and thermal cycles found in road and performance driving.

• Rated working pressure around 1 MPa with blast resistance up to 2 MPa
• Hose operating temperature range from -30°C to 120°C
• Vacuum-return action allows coolant to flow back into the radiator as it cools
• Tight cap and O-ring prevent unintended coolant venting

How will this tank protect my cooling system long term?

By replacing aging plastic overflow bottles with a metal reservoir, you reduce the chance of leak-related coolant loss and internal rust formation that can occur when air and contaminants enter the system. A proper overflow system helps preserve coolant condition and maintain stable engine temperatures.

• Reduces corrosion risk by limiting air exposure to coolant
• Prevents coolant loss from cracked or degraded plastic tanks
• Maintains coolant volume for consistent thermal performance
• Easy-to-clean metal surface simplifies maintenance

Who is this for: Drivers who want a durable, serviceable alternative to stock plastic overflow bottles — including enthusiasts upgrading cooling components, vehicles used in spirited driving or mild track days, and any owner seeking a longer-lasting, leak-resistant reservoir. Fitment checks are recommended: confirm radiator cap type and hose diameters on your vehicle before purchase.