Re: What is this part sticking out the side of a '79 Santana
My old camper had a valve like that. It had a handle on top you turned to get some water while outside. Looks like your valve handle is broken off. We had that happen once and replaced the valve. Any camper supply place should have the valve.
If that really is a water tap, I don't know what the red could be and I'd worry about the water inside.
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