This silica gel container is inserted into the spool of filament. It is not screwed on. It can be easily replaced with one hand. (fig.1)
 

The color of the silica gel can be seen at a glance. (fig.3)
 

The size is as shown in the figure. Please check if the size fits your spool. (fig.4)
 

The silica gel fits perfectly into Prusament, which has a small spool hole. (fig.5)
 

The container has a protrusion at both ends, which hooks onto the spool. If the spool is placed horizontally, it will not slip off easily. (fig.6)
 

It holds about 70g of silica gel. (fig.7)
 

Please find a sturdy material for the transparent window. I used plastic wrap film for packing. (fig.8)
 

Cut the film to the right size and put it over the window. (fig.9)
 

Cut the film that is sticking out. (fig.10)
 

Finished. (fig.11)
 

The size of the hole is about 1mm. In my country, silica gel with small grains is the mainstream. (fig.12)