727 Front Seal

I drive a small/medium straight blade screwdriver through the seal at an angle from the outer edge between the seal and pump then pry it out but you have to be careful not to damage the pump when doing so. If you want to be safer Sears sells a seal puller that works pretty good.

Here's a link to it

http://www.sears.com/shc/s/p_10153_12605_00947645000P