correct socket size?

[iontrap]

So I want to do a drain and refill on the rear end of my truck. The largest socket I have is as 7/8. Do I need a 1"?

 

[cpayne5]

So I want to do a drain and refill on the rear end of my truck. The largest socket I have is as 7/8. Do I need a 1"?

It's a metric 24mm.

 

[greasefingers]

A 15/16

 

[iontrap]

Thanks guys, I'll pick up one of each. Never hurts to have more tools!