It looks like that cap is something from a hot rod shop and I'd bet the snorkel is made from braided radiator hose from the same place. I used to go into a couple of them and there were piles of shiny chrome and polished parts just like that.
I’m no hot rodder but you used to be able to get bits and pieces in some of those places that could be adapted for more utilitarian purposes. The quality was all over the place but at least in a rod shop you could handle the part and make a more accurate assessment. I’ve taken quite a few bits and pieces and used them as components in projects. By the time I’d finished they didn’t bear much resemblance to the original.
Rodders used to be very particular about having hoses and fittings that conformed to certain pathways in vehicles so the shops would sell a huge range of angled fittings for example.
