The Cigar Oasis Magna Large base holds up to 1 gallon of distilled water. Base alone dimensions: 12.7(L) 10½(W) 5.5(H). Dimensions with the control top: 12.7(L) 10.5(W) 8(H). PLEASE NOTE: This unit is ONLY compatible with Cigar Oasis Magna and older II-XL models. Check before you order.