Spanner for seawater filter (Vetus, Allpa...)

A simple tool to loosen the lid of your seawater filter, which is usually insanely tight due to negative pressure.

I've created both versions:

• Spanner for seawater (single) - for the lid with one tab

• Spanner for seawater (cross) - for the lid with the two crosswise tabs

If you like this design, please post your print with a picture.

Anybody willing to support with a small donation is more than welcome ;-)