3 wire not grounding. Flush mount dryer outlet. NEMA 10-30. UL listed for use with aluminum wire. Double wipe contacts of high performance copper based alloy. Quality materials. Durability, time-tested design. 30 Amp 125/250 Volt Color: Black 3 pole 3 wire not grounding Flush mount dryer outlet NEMA 10-30 UL listed for