u/Desperate_Thing_4613

Hi all, does anyone know if the old pac fab nautilus de filters have self bleeding air valves? Or is the black thing attached to pressure gauge it? I can’t seem to find an instruction manual online for this old thing and I’m new to owning a pool. Yeah I know it’s called a silver bullet- I’ll replace it when I have the funds but for now just trying to learn basics of pool ownership. Thanks!