Size guide
Not sure which size to order?
Please note: this product has been replaced by a new spanner wrench, which is compatible with the GCE Zen-O and GCE Zen-O lite. Click here to go to the product page.
GCE Spanner Wrench
The GCE Zen-O oxygen concentrator has an output filter directly behind the cannula outlet. The manufacturer recommends to change this filter yearly or when needed. To remove the cannula outlet, you need this tool.