The US Divers Surf Lung was a toy that allowed a child to swim on the surface only while breathing through a double hose snorkel.  Any kid that got this toy thought they had the coolest Dad in the world.  It is very cool indeed.  This one was donated to the Museum by an anonymous benefactor.  This one has seen a lot of play and the hoses are in very sad shape, but it is still very neat. Click here for action shots from EBEN