The Top Box is a comprehensive range of ceramic quarter turn and traditional rubber washer cartridges. One box includes 6 pairs of rubber cartridge valve cartridges and 19 pairs of ceramic disc quarter turn cartridges. The exception to this is CC1C and CC1H which are half turn. See individual codes for expanation. The handy Top Box has each box section coded, so you can easily refill the box with more tap valve cartridge spares when necessary. The Top Box holds 1 pair of each cartridge. Please see our GIGABOX for larger quantity and storage options.