It's the lowest one on the pass. side. Looks like maybe a transmission or oil coolant line. Is there a special way to remove it? Thanks!

 

Transmission oil cooler line. ½" flare nut wrench recommended.

 

Thanks! All my line wrenches and stuff seem to have disappeared when we moved into our new house so I will have to pick some upi after work. Will a 750lb engine stand be safe enough or will a 1000 be more sturdy?