Those are just a small wire screen inside. If you want to convert to something with more capacity and visible just get a couple of fittings and a plastic replacement.
qty 1 of a 1/8" male NPT to 5/16" hose fitting
qty 1 of a 1/8" female NPT to 5/16" hose fitting
qty 1 of a NAPA 3972
I used a...