6061 Aluminum Coolant Overflow Reservoir

The STM Tuned coolant overflow reservoir offers a durable and stylish upgrade for your Mitsubishi Evolution VII, VIII, or IX. This unit is designed as a direct replacement for the OE plastic tank, addressing potential failure points with its robust construction. It is tig-welded from 6061 aluminum and handmade in-house at STM to ensure quality and longevity. Included with the reservoir is a black anodized cap, stainless steel allen bolts and washers for secure mounting, and a brass drain fitting for easy maintenance. The reservoir bolts directly to the factory location, simplifying the upgrade. Specifications include a lightweight design weighing only 1.48 pounds. The reservoir itself is constructed from tig-welded 6061 aluminum, complemented by stainless steel hardware and a brass fitting. A 4-foot length of 6mm silicone hose and a 90° 1/4" NPT to 3/8" brass barb fitting are included in the kit. STM offers a lifetime warranty on its parts against manufacturing defects to the original purchaser.