When I went looking for a washer bag, I saw a lot with an attached pump. The TCS Federal (just looked it up in the parts manual and that was the only model with the electric pump), has the pump mounted on the back of the dash board so the original bag was just a bag. I do think having the pump at the bag is a better idea, though. If it needs to be replaced, it is MUCH easier to get to and it should pump better, too.