I really love this product. From all the vaporizer I have used in the past this is the best. Smooth inhale , the water cools down the smoke and packs a punch. The product deserves a 5 star but sadly after receiving my unit the glass tube had a little sharp chip and after the first wash when trying to reinstall the tube the glass made the rubber fitting in the bottom tip apart basically making it unusable. Contacted customer support and they send a new glass tube and rubber fittings. You may wonder why a 1 star review if everything sounds perfectly. Well the rubber fittings are totally different. They send some instructions how to install every rubber fitting. But the one that goes under the glass tube the instructions aren't clear enough and the image is a drawing a really bad one. The more you look at it the more confusing it gets. The instructions says to lay it on the bottom and with the glass twist and push down until the rubber falls in place. No matter how much you twist and pull the rubber will simply get stuck and rip apart or the glass tube will simply spin and not even make contact with the rubber. If you manually push the rubber fitting in the bottom with he pick tool the glass tube won't fit. No matter how I try to install the new rubber fittings it simply breaks, doesn't make a seal or won't let the glass tube fit. Basically I have a barely used unit like less than a week of use and its unusable. The few times I used it I love it but simply bad instructions and changing the fittings to one that is totally different design. No matter how I try to contact customer support they say the exact same thing yes the rubber goes on the bottom just follow the instructions, yeah much help. They have a video tutorial for EVERYTHING except how to change the rubber fitting simply a poor drawing saying how it goes with instructions that simply breaks the rubber and the design being different it won't fit like the original fitting. The product is 5 star. Warranty is 5 star you have a issue they make everything possible to help you. As I said they send a extra glass cause the one I had was broken, the fittings broke they said new ones but sadly instructions aren't straightforward I have been in the past month trying to fix this issue and customer support simply dosen't understand they use the same copy paste answer which is annoying. Tried sending images saying its supposed to look like this? And they say just follow the instructions. Tried to search in the web if there's a tutorial or something but there's nothing just the normal maintenance and how to disassemble the unit ,etc. I simply gave up with the poor customer support is a big let down. The fittings the original one goes in a small circular hole in the bottom around the bottom of the glass making a seal against the glass. The new fittings goes on the bottom but sits on top of the air intake inside the tube basically making inhaling more difficult, as soon as you inhale the rubber fitting lift with the suction and breaks the seal making water drip on the side and possibly couldn't damaging the unit in the future. The last email was a week ago and so far no reply. They gave up and the process i did too. If they could fix that fitting in the bottom or bring the old design back this will be a 5 star review but since my unit is unusable for more than a month this is a 1 star review. If you wanna try something different that will be hard not to use go ahead and buy it. But remember that after the original fitting to make a seal with the glass break your unit won't be the same.