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Exactly how reversible they are depends on the type. Regardless of the type though the sucess rates for reversal aren't great. If you're lucky andyours is easy to reverse then there is an 80% chance of sucess for a reversal. I also highly doubt most insurance companies cover reversal so prepare to pay thousands of dollars out of pocket for that maybe 80% chance. A vasectomy should always be considered permanent and any doc performing one will tell you that.