It will for sure hold 3, with CO2, Im not sure i could fit 4. I only have 3 but I'm curious if a 2.5 would fit too. Last week I got a chrome 4 tap T-tower for $60 on CL, so i really hope i can remote the CO2 and run 4 taps. If not, I got a 2 tap from the same guy... Any thoughts?