I think thats a DSE801 which I use, they are bigger and have a much bigger reservoir to fill your liquid in them than the smaller 801 Atty, I have been using these for quite some time and find that they are the best out of all of them, if it's the bigger 801, they have a serious amount of polly fill and they also come in a HV Atty which is what I'm using on my GGT and my Silver Bullet and have found that using these HV801 Atty's are second to none out there (IMHOP)