Power steering pump nut/o-ring size?

[DavidB]

'88 K5. What size wrench is supposed to fit that stupid flare nut? Nothing fits well. 16mm and 5/8" are close, but loose.

What size is the O-ring? Mine got munched.

Would a hi-temp O-ring be a good idea as the pump is right next to the exh manifold?

 

[Randy92782]

i thought it was a 5/8" or a 15mm

no idea about size of the o-ring

i'd say a standard o-ring would work. sure that's all it has now