The Rear Cap from the Layer-X Filter Shell, sold on its own.

A hybrid of thread and magnet: a BASE filter screws in, and a PLUS filter attaches magnetically. Pair it with a Front Cap to carry your stacked filters between the two caps.

For replacing a lost cap, or for carrying another combination of filters.

Includes: 1 Rear Cap (Front Cap sold separately)

For the pair, see Layer-X Filter Shell (Front / Rear Set).