Tank bands come as a pair to hold your twinset together, the bands include the bolts, nuts and washers required. All hardware is made from 316 marine grade stainless steel to prevent corrosion. The size required depends on the tank being used as listed below.
7L - 140mm
10.5L & 12.2L std - 178mm
12.2 compact, 15L & 18L - 204mm