As of summer 2026, we transitioned to capsule 2.C, which has a capsule shell shorter than capsule 2.0/2.1. We have designed a new capsule link to account for the length difference, so it's cross compatible with v2 props like contact staffs, chucks etc.
You can connect 2 capsule lights with a capsule link. Remember to remove the C-ring from the inner capsule and replace it with a capsule o-ring before putting the 2 capsules in a tube :)