Clutch Slave Cylinder keeps blowing out.

What is your question?

I had a slave cylinder go out a couple of weeks ago. I replaced it with a Slave from Car Quest. With in three hours after I installed the new slave it blew compleatly out, Cracked allong the manufacture seam. I then replaced both master and slave and it blew out the slave with in hours. Today I installed the third replacement slave cylinder with the same results, slave blew out within hours. I cant have bought 3 bad slaves in a row, what could cause this to happen.