I purchased a Yocan evolve plus XL special. Got it home, loaded it with concentrate realized that the coil cap is missing. Went back to get one, was told I would have to clean it and bring it back to get the part I need. Which means I would have to waste about a 1/4 gram of concentrate so that I can get the $2.00 part that I need. I will not be going back to this OASIS, And I will tell everyone I know to stay away.