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Heating and Cooling› Overflow Tanks and Catch Cans

ZZPerformance

Coolant Overflow System Kit

Name: Coolant Overflow System Kit
Brand: ZZPerformance
SKU: ZZ-OPTBK

$95.99

SKU: ZZ-OPTBK

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$100 Minimum Order

Non-Returnable Item

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Easy — 1–2 hours

Overview

It comes as a complete kit, excluding the mounting bracket. This system ensures continuous coolant flow to the overflow bottle, trapping air at the top and returning air-free coolant.

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This complete kit provides everything needed for installation, with the exception of a mounting bracket, which is available separately for specific applications like the Cobalt and Ion Redline. The primary function of the Option B kit is to facilitate air removal. It ensures that coolant consistently flows out of a small line, feeding the Option B's overflow bottle. Any air purged from the system collects at the top of this bottle, while air-free coolant drains from the bottom and returns to the intercooler pump and heat exchanger(s). This continuous circulation and separation process helps maintain optimal performance and prevent air pockets. ZZPerformance offers specific mounting brackets for the Cobalt and Ion Redline vehicles, available for separate purchase. Detailed installation instructions, including diagrams and GM-specific guides for the Dual Pass and Option B kits, are provided digitally and can be accessed via links on the product page.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

Brand	ZZPerformance
Part Number	ZZ-OPTBK
Category	Heating and Cooling

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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