Steering Box Fitting Size?

[Mr. Notorious]

I'm trying to figure out which of these fittings would be for the low pressure side of the Steering Box. I see there is non-O-Ring and O-Ring styles. I figured there was an easier way that buying all 5 and returning what I don't use. I have an OCD habbit of not taking stuff apart until I have the new right stuff on hand.

- I assume no teflon tape should be used at this connection?
- Anyone know which fitting I would need here?

16x1.5

17x1.5

18x1.5

18x1.5 O-Ring

16x1.5 O-Ring

 

[ThreeEyedBandit]

Low pressure - M17x1.5 inverted flare
High pressure - M16x1.5 inverted flare
Neither use Teflon tape