Every gascolator I have ever seen had a flat screen mounted in the top.
There is not a filter element in the can like you might assume. The can is just a large volume collection point for sediment and water.
With bowl (can) removed, look up at the bottom of the gascolator body. You should see a flat fine mesh screen.
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Van's Aircraft Engineering Prototype Shop Manager
RV-6A (aka "Junkyard Special ")