Convoy s2+ metal tail cap waterproof?

I’ve been looking but can’t find a definite answer on how/if the colored s2+ metal tail caps are waterproof. Anyone know?

On my version the tailcap would be waterproof but I would not take it diving.

Looks to be more water resistant. Though it wouldn’t take much to make it waterproof. Add a sheet of rubber / silicone sandwiched between a washer and the inside tail back surface.