Is it a manual foot pump?

If so it goes to a "T" section, branching off to the squirters and to the resevoir. There is a little ball in the "T" section that makes sure the water goes in the right direction.

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306D 1975 (camper) - rusting away
W116 450 SEL 1975 - sold
W114 long wheelbase ambulance, 3 litre diesel 1974

VW Golf 1 convertable - midlife crisis item
VW T4 van - support vehicle