a/c service question

[cobrafever]

I have a few o-rings leaking in my a/c system, is there a special tool to seperate that funny looking square clip thing to get to the o-ring..???, Or just what do i need, I have done some service work on a/c's just need to know what tool I need before I start.....thanks for any help

 

[STAMPEDE3]

Same tool as for ford fuel lines.
The have plastic and metal.
The plastic set is about $10 for autozone.