Welcome , Although they don't say on their site . They look similar to a 510 connection . That being said , the only way to be sure is get a 510
device ( atty , or carto ) and see if it fits , if so great , if not , then Kiwivap is correct . Just pick up a 510 or 808
device . Will be a lot cheaper , in the long run . And 510 would be my choice , as that is the most common thread size , used today . Good Luck