Kanger Aerotank Giant fit perfectly on my Seven-22, looks like it was made for it. Have a GL50 (18650) now with an Aspire Nautilus on the way, so the Giant is collecting dust. I would vape around 10-16 watts no problems with the slotted coils it was great. Bought some coils from Fasttech and they had drilled holes instead, felt like I was getting less juice in, might have not primed properly though.