Heating and Cooling› Overflow Tanks and Catch Cans

GK Tech

Replacement Overflow Bottle

$69.00

SKU: S145-OFLW

In Stock
In Stock
Ships by Sep 12
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
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Easy — 1–2 hours

Overview

The GK Tech S14/S15 200sx Replacement Overflow bottle is designed to address a common issue with cracked overflow coolant bottles in these vehicles. It serves as a direct replacement for the original part, with the original part number being 21720-65F25.
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The GK Tech S14/S15 200sx Replacement Overflow bottle is engineered to solve the prevalent problem of cracked overflow coolant bottles found in S14 and S15 200sx and Silvia models. Constructed to high standards, this overflow bottle is a 100% direct replacement for the factory component, simplifying installation and ensuring compatibility. It replaces the original part number 21720-65F25. The product is noted to be thicker than standard Nissan items, suggesting enhanced durability and a longer lifespan compared to the often brittle original plastic. Installation is straightforward, with customer reviews indicating it can be completed in as little as 5 minutes. The direct fit nature means no modifications are required, making it a hassle-free upgrade or replacement. This overflow bottle is specifically designed for the Nissan S14 200SX/Silvia and S15 200SX/Silvia models.

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

BrandGK Tech
Part NumberS145-OFLW
CategoryHeating 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.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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