Replacing a leaky natural gas valve

[y_p_w]

I think I know what the steel fitting is, or at least an equivalent.

BrassCraft AU2-6-8S 3/8 in. O.D. Flare x 1/2 in. MIP (3/8 in. FIP) Steel Gas Fitting

AU2-6-8S BRASS CRAFT MALE UNION 3/8 OD X 1/2 MIP X 3/8 FIP

supplyonline.com

The 3/8” flare side was forced into a 1/2” FIP fitting with a lot of RectorSeal 5 at the tip against the valve fitting. The 1/2” MIP side is odd, as there’s also a 3/8” FIP fitting inside. Anyone know what this is meant for?

 

[walterjay]

Used to connect a gas whip.

 

[y_p_w]

Used to connect a gas whip.

I see that now. I guess the dryer line here was narrower. Not sure what’s the point of the 3/8” FIP on the same end as the 1/2” MIP.

 

[Mazomopar]

I think I know what the steel fitting is, or at least an equivalent.

BrassCraft AU2-6-8S 3/8 in. O.D. Flare x 1/2 in. MIP (3/8 in. FIP) Steel Gas Fitting

AU2-6-8S BRASS CRAFT MALE UNION 3/8 OD X 1/2 MIP X 3/8 FIP

supplyonline.com

The 3/8” flare side was forced into a 1/2” FIP fitting with a lot of RectorSeal 5 at the tip against the valve fitting. The 1/2” MIP side is odd, as there’s also a 3/8” FIP fitting inside. Anyone know what this is meant for?

Just a way of having the fitting multi task. You have 1/2 Male if you need it, or if you happen to need 3/8 female, its built in and don't need a reducing bushing.