> For the complete documentation index, see [llms.txt](https://hrftank.gitbook.io/hrftank/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hrftank.gitbook.io/hrftank/iii-build-manual-electronics/12.-water-cooling/12.0-before-you-start.md).

# 12.0 Before you start!

<figure><img src="https://673609632-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FhmKl11OGPwbKiNEUvA5L%2Fuploads%2FL0FRKCrujN7iV6zIUdpD%2Fpumpki.jpg?alt=media&amp;token=2bd5b6bd-1009-4cc8-9a90-5458c24b3b7d" alt="" width="563"><figcaption></figcaption></figure>

Originally, the cooling pump in the HRF Tank was intended to be a Freezemod PU-FS6M pump – which is why there are M4 screw holes with the appropriate spacing in the rear part of the hull floor. Such a pump, although probably more reliable, is much heavier and more expensive than the solution I later came up with, based on a type 370 micro pump. **If you decide to use the mentioned Freezemod pump** for PC water cooling:

* do not print the 'Cooling liquid pump holder' files - [12.1 3D printing elements](/hrftank/iii-build-manual-electronics/12.-water-cooling/12.1-3d-printing-elements.md)
* you don’t need to prepare M4 threaded inserts - [12.2 Parts required for this step](/hrftank/iii-build-manual-electronics/12.-water-cooling/12.2-parts-required-for-this-step.md)