Coolant Tank Cap

The Coolant Tank Cap is a 3D printed replacement screw cap for a truck coolant tank, sized to fit a 44.5 mm inner diameter opening. It is a simple, non-pressurized screw cap (not a pressure-relief radiator cap with a spring valve), intended to seal a coolant reservoir or overflow tank opening where the original cap is lost or damaged.

The cap is 3D printed using ABS plastic filament.

Device data

Design files	https://www.appropedia.org/File:GN018_Eng_Dwg.zip
Schematics	https://www.appropedia.org/File:GN018_CAD.zip
Hardware license	CERN-OHL-S
Certifications	US000191 Verify

Levels are identified based on this reference: Field Ready Readiness Levels

Open the file using slicing software and prepare for 3D printing. Use the printing settings below (settings may need adjustment depending on the specific 3D printer brand and filament manufacturer used).

Safety Note: This cap must only be used on a non-pressurized coolant reservoir or overflow tank opening. It should not be used to replace a pressure-relief radiator cap, since ABS plastic is not rated to safely contain a pressurized, high-temperature cooling system, and doing so could result in cap failure.

About the manuals

Field Ready develops manuals to support both the fabrication and safe use of its products. A maker manual provides step-by-step instructions for replicating the design, including materials, tools, and assembly guidance, so that makers in different locations can build the product accurately and consistently. A user manual, where applicable, explains how to properly set up, use, and maintain the product once it is built, helping ensure it performs safely and as intended for the end user. Together, these manuals make the design accessible to both fabricators and the people who ultimately rely on the product.