Water Bong* cap

My friend wanted me to design a cap for his bong to keep flies and stuff out of it after he saw eggs all over the side of the glass… He has a couple larger beaker style bongs and a few other glass pieces that this fit on perfectly. The inner diameter of this cap is 62mm, the center extruded diameter is 30mm, and the walls are 20mm tall. I printed this one in PETG since he keeps his stuff in his garage but this can be printed in any filament really.