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.
| Type | Universal pressurized coolant expansion tank |
| Capacity | 1240 mL |
| Material | CNC billet 6061 aluminum; anodized aluminum bracket; stainless steel hardware |
| Ports | 1 x 6AN ORB (9/16"-18) top; 2 x 10AN ORB (7/8"-14) bottom; 1/4 in aluminum pressure bleed barb |
| Cap | Type A radiator cap receiver; 32mm import style cap sold separately |
| Size | 139mm W x 97mm D x 193mm H (without lower fittings) |
| Mounting | Anodized aluminum bracket, 4 height positions over 26mm; stainless hardware included |
| Quantity | 1 |
| Part Number | 20-2270 |
| Warranty | 1 year limited |
Documents: Installation Instructions (PDF)
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Returns: 30-day returns on new, unused items in original packaging. See the full Refund Policy.
