Hi Artsci:
I did some research to try and work backwards from your photos and descriptions to work out the parts:
Receptacle: Hubbell HBL460R9W
Plug: HBL460P9W
Buried junction box: Orbit 7" Round Sprinkler Valve Box - 53810
4" PVC Pipe - grey, schedule 80 (thick) with associated adapters for...