 Welcome to BCH Technologies. This is Kevin. Today we will talk about the back chamber refill method for axial cartridges. For the axial cartridges, you can see the back chamber is full of ink, and it serves as a supply tank to the front chamber. It works exactly like a pad water dispenser, which the back chamber is a sealed tank of ink, and it has a really small opening at the bottom, so the ink will flow to the front chamber if there are any ink consumed at the front chamber. If the dog or your printer didn't consume any ink, it will have a little bit of ink in the front, but it holds the majority of the ink in the back. We use NiO2 cartridge as an example. Those are NiO2 axial cartridges, which we bought from eBay. We cut one open, and you can see it's completely dry, and I'm trying to show you it's a small opening on the bottom. We got this about a dollar cartridge. There's not much special tool required. We just use two of them, and you don't have to use them. It's optional. One is those little silicone washers. Another one is the clips. Silicone washers just give you a better seal around the intake, so you are confident that ink is not going to leak. If you refuel correctly, your cartridge shouldn't leak ink at all, so this is just a precaution. I like to install the silicone washers just for peace of mind. You just have a shorter side towards the seal, longer side towards the printer, and lay on top of it. If you need a set of washers, you can go to bchtechnologies.com and go to accessories and elbow and washers, and there's a five-piece second washer. We're going to drill a hole in the back chamber. If you remember all pad dispenser or water dispenser analogy, we're going to have a big hole on the water tank, so what happens is the ink is going to flow out. To make it less messy, we have this protective clip. Again, I said bchtechnologies.com and go to accessories and protective clip. I call it Pormans 564 review kit. Because the clip is made for multiple models, so it's pretty tight for 902, so you have to push it harder to get it in. Again, you don't need to have this. Let me show you, you can do the same thing with duct tape. Now I start peeling off the label and expose the refill hole. Notice I don't peel the label all the way, so I can know which color it is. If you peel the label off, it's pretty hard for you to tell which color it is. I'm going to use a larger drill and also a smaller drill to push the ball inside. Also, we're going to try somebody recommended using a lighter and a paper clip. We just get a hole a little bit wronger and remove the debris. Now with a smaller drill. Now we try it, people suggest using a paper clip and a cigarette lighter. The goal is actually fishing the ball out, so you can use the ball as a plug. You don't need a plug later. We just don't like it, but you can see how it's done. The paper clip is too soft to poke it out, so you'll need something harder to poke it out. For the plugs, you can go to accessories and plug. The two plugs that works are 4mm plugs. What you want to get is a clear plug, which is 4mm, or you want to get those color 4mm plugs. Both of them work. I don't recommend these green plugs, which are 3mm. It's a little bit small. Again, you don't really need a plug. You can try to reinsert a ball, or you can try the hot glue or some kind of thing to seal it. Later, we're actually going to show you how to use a duct tape seal it. Now we can start to fill it with ink. We use the ink from Refill Ink for HP. Then we click 120mm here. We use this ID30 KCMY-AH, which has four bottles of ink and a drill. We'll fill it all the way to the rim. We'll seal it with a 3mm plug, which we are not recommended, and we'll show you what's going to happen. This printer is a pigment printer, so whatever left in the cartridge is dried pigment ink. We directly add dye ink on it, so we convert it to a dye printer. This is not the best way. The best way is to add dye ink or add water to flush out the dried pigment. Then you add dye ink to it. I have another video to show you how to flush out the printer, but sometimes when we're in a hurry, we just do this way and do the unclogging if it's clogged. We're showing a different method to seal the cartridge. We have 3mm and 4mm clear and the 4mm color one. For the black, we're going to seal with a piece of duct tape. Now the whole cartridge is filled to the rim, and we remove the seal on the bottom. If you feel it correctly, you should not have ink flowing out. If you see the ink flowing out like a faucet, then you have a problem. You may have a couple ink drops, but not a lot. This just shows you. We remove the clip and we just set it on the top of the printer with white paper on underneath. The blue is going to leak because we only have 3mm plugs. This is what people complain as they complain after they refill the ink drops keep flowing out. The others should be fine. We set it there for 20 minutes. If you want to flush the dried pigment out, what you can do is you can add water or ink and then unplug the top. Fill it up, unplug the top, and let the cartridge drip like this. BCH has clear ink base, which is the ink without color. For example, if you want to switch to dye ink, you can buy dye ink base. You can add dye ink base to the cartridge and flush the pigment out. 20 minutes later, this all happened. We made 2 4mm plugs sealed really well and duct tape sealed really well, but not this green plug. Now we switch the plug to 4mm and we're ready to put it back to the printer. Remember to turn the chip info off and also do 2 consecutive cleanings before you use the printer. If the printer is clogged, do 2 or 3 cleanings, then wait 2 hours. If after 2 hours do another cleaning, and if the printer is still clogged, you might want to watch our unclogging video. I hope you enjoyed this video. Please visit us at www.bchtechnology.com or locally at Greensboro, North Carolina. Thank you and good day. Cheers!