there is also this

http://www.amazon.com/Conntek-Generator-Adapter-Locking-Connector/dp/B002E1YOQ4/ref=sr_1_40?ie=UTF8&qid=1411174564&sr=8-40&keywords=220v+adapter+dryer

also a version of this with diff 220v plug at the other end from the dryer outlet...can't find a pic but they exist