Strangely, I’ve appreciated GRAV pieces before when bought through third-parties, but GRAV has directly let me down… SIGNIFICANTLY. First, it came a day later than the 3-5 day window I was given, which was a major bummer… I passed up Labor Day sale discount to try to get it sooner… then, they sent a generic bowl (flower) instead of the nail (concentrate)… THEN, they sent a male nail instead of female, and at this point, I was pretty let down. Finally, they send the correct female nail, and it cracks right away when we try to use it. Just a typical torch on low setting cracked it… awesome. Not sure if I will invest in any other GRAV pieces. Customer Service seemed nice about it all, but this is just pathetic. Good luck if you try this! It doesn’t seem to work anyways, no air comes up when you try to pull. Only the smaller piece seems to work with the Gravitron. May just be better off using an empty 32 oz. bottle if you ever want to do a GB.