Hi,
I'm trying to find a 100 or 150 amps heavy duty plug and receptacle (and box) that will be used outdoors (thus needs to be water tight or water resistant). I've found all of them from Hubbell, but this is not cheap. Anyone knows of an alternative? This is to hook up a mobile cabin that will be used as a concession stand.
Many thanks,
Peter

I am sure your looking at the Pin & Sleeve connectors, also equals are made by Russell Stoll, Meltrix, P&S, Leviton and others. And, yes, they are all very expensive. There are no other alternatives that are cheaper.

You may find used ones on Ebay or electrical surplus suppliers.