Underground splice on 12/2 UF wire on a 20amp GFCI Protected circuit.

Splice Kit I used:
Gardner Bender HST-1300 Underground Cable Kit for Waterproof, 14-8 AWG, UF Copper Wire-Includes: 8 inch. Heavy-Wall Heat Shrink & Screw Splice Connectors , Black https://a.co/d/aKTohYH