Radium Engineering Coolant Tank - Universal 1240 mL

This is a pressurized coolant expansion tank rather than an overflow bottle, so it plumbs into the cooling circuit itself. The multi piece body is CNC machined from billet 6061 aluminum around a tall water level window showing 118mm of coolant height, and its two internal chambers connect through crossover passages at the top and bottom. A 6AN ORB (9/16"-18) top port takes hot water in and bleeds air naturally, a 10AN ORB (7/8"-14) bottom port returns coolant to the water pump suction, and a second 10AN ORB port can be run to the highest point in the engine. The billet receiver accepts a Type A radiator cap, and the included anodized aluminum bracket offers five threaded positions per side so the tank can be raised or lowered across 26mm.

Specifications

Documents: Installation Instructions (PDF)

Shipping

• In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
• Standard, expedited, and overnight options at checkout.
• Oversized items ship by freight and take longer.
• Backordered items ship as soon as stock lands — contact us for lead times.
• International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.

Returns

• 30-day returns on new, uninstalled items in original packaging with all hardware.
• Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
• Installed or used parts can’t be returned — confirm fitment before you install.
• Special orders and custom items are final sale.
• Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Refund Policy