Do not use tools that are not made for tightening valves. Those can damage both the inlet and exhaust valves. The valve tool is already included in the most recent SSP-1 batches.
It is not included with the SSX-23.
Small yet functional:
A minimalistic tool that every airsoft player needs. Sooner or later, every valve gets a little bit loose and starts leaking. This tool lets you tighten the exhaust valve and the fill valve of your gas magazines.
Moreover, it is also compatible with most of the brands on the market. Small size and lightweight – you should have this in your tool kit!