How to replace primer blub on Ryobi 700r 2 cycle gas trimmer

Hi,
There are generally a pair of barbed tabs top and bottom that when squeezed toward each other will release it. Do note that on the back are a longer and a shorter tit for the hoses to hook to. Make note of which goes where and the orientation of which of those is top and bottom. A small screwdriver canbe used to pry and loosen the hoses. Push the new unit in place and reconnct the lines. If you connect the lines backwards, it will not purge the carb, so try reversing them.
Peace,
Clarke
PS Lo and behold in answering another question, I happened upon this picture.