Coleman Stainless Steel Coffee Percolator, 12 Cup

Nice quality, durable, and makes delicious coffee! Used on glass stovetop, (use burner the same size as bottom of pitcher). Can use on a camp stove too. (Nice back up when the power goes out) No issues with glass knob!! The key to this is gently tighten all the way to the right, then come back about a quarter inch. (pencil width). There should be a jiggle noise and a wiggle. Too tight and your knob will break, too loose and water will bubble out. My tip is tried and true!! Filter is optional. I use a regular basket style filter. Flatten out, fold in half, repeat, repeat. Cut tip off the end, about an 1/8th inch. Open up, place over stem. Course grounds, regular will also work. Fill to the bottom hole on spout for 8 actual measuring cups of water. I use 1 Cup of grounds, covering stem hole in basket to avoid loose grounds. (makes about 4 mugs)... I've also halved the water to 4 C water and 1/2 C. grounds. (about 2 mugs with possible warmups). Once assembled, bring water to boil on med/high heat, once percolate starts, reduce temp to med. low. ...percolate 7minutes. you'll see the water turn to coffee. take off heat. coffee will be piping hot, fresh, delicious! I have never been able to drink coffee black until now! (and enjoy it!). The sturdy pot retains heat really well for warm ups. I was concerned about the handle being hot and needing a potholder. I use my bare hands without any problems. SO GLAD I got this one! I hope this helps!