Match the plug to the 220V outlet receptacle you have or plan to buy. I have a NEMA 6-20 220V plug and wall receptacle. It has one vertical and one horizontal blade and a ground blade. A NEMA 15 amp plug has two horizontal blades and a ground blade. There are a variety of choices but the NEMA 6-20 plug and receptacle is commonly used with dive compressors. The plug and receptacle are less bulky than a dryer plug setup. Here is a photo of a Nema 6-20. 220V compressors do not come with plugs because there are so many different receptacles. New Bauer compressors don't even ship with wire or on/off controls. They require the owner to connect their own wire and control box to their 220V motor. That is a negative selling point for such an expensive compressor line.