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NEW - Leviton 2723 Locking Connector 3P 4W 30A 250V L15-30R
Black is the default here, and it matches most other business equipment you own.
3-PACK-Leviton 2723 Locking Connector 3-Pole 4-Wire Grounding 30A 250V
What stands out is the black finish that resists UV rays, so it won't fade in sunlight.