Not sure what the other bits are woodsman. As CZ says it's just the valve itself, the O-ring and the lockring.
As for sealant I've got away without it pretty well for a couple of years but I only run UST tyres, not ghetto or "tubeless ready". The only punctures I've had have been big slashes through the tyres from rocks which I don't imagine any sealant could cope with. Then again there aren't a lot of thorns in the Peak so it depends where you ride.