The replacement transformer for the Pump In Style Original and Traveler models is a 9V transformer, model 920.7010, Medela part 68030 (also known as part # 9007056 or part # 8007265). Input: 110V AC 60Hz 18W. Output: 9V DC 1000mA.
If your Medela PIS pump was purchased in 2008 or 2009 or 2010 and says "Advanced", check where you plug in the adapter to see if you need a 9V or 12V power adapter. More than likely, you need part # 9207010 (item # with retail packaging is 68030). This is a 9volt with 12vdc max.
Shipping Weight: 1 lb.
Transformer 9 Volts (U.S.A.)