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AC WORKS 1ft 10/3 NEMA 5-15P to NEMA L5-30R 30A Household$42.99
This AC WORKS brand adapter S515L530-012 is very durable. The adapter is 1-foot in length and is a NEMA 5-15P to NEMA L5-30R. The NEMA 5-15P is a 15 Amp, 125 Volt male plug.
The NEMA L5-30R is a 30 Amp, 125 Volt, 3-prong locking female connector. The pigtail style adapter has an STW, 10/3, anti-cold weather cable that stays flexible in extreme temperatures.