Do a search for California 50A locking. That style can be found in a 3p4w configuration. I don't think they will be waterproof unless you get the special plugs that have seals.
Check out this catalog for ideas, other manufacturers make similar products.
Secondaries: Lakefront India Brown Ale
On Tap 1: Rootbeer, On Tap 2: NB White ouse Honey Ale, On Tap 3: Nitrogen, On Tap 4: Air, On Tap 5: Air
On Deck: DIPA, Imp Stout, Porter, Wheat, Black IPA
"No sense having empty carboys around when full ones take up just as much space. " - Me