The boosters are liquid.

I was wondering if it is some sort of low positive pressure purge system for the empty liquid fuel tanks on the boosters, but those ‘buckets’ do not seem large enough to handle the volume of pressurized air (nitrogen or helium, usually) to adequately do that. Plus, that hose out the bottom of each looks more like a ‘drain’ almost of some kind.

So, not really sure what they are.

Earl

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Earl L. Cagle, Jr.
NAR# 29523
TRA# 962
SAM# 73
Owner/Producer
Point 39 Productions

Rocket-Brained Since 1970