How to remove 'old' brass flare fittings??

[mac1911]

The project requires remove several old, weathered, brass flare fitings. I have had success with PB Blaster on steel, however the first 2 fittings I tried failed. The wrench twisted the hex sides.
Is there a solution better suited for brass?
Heat is not a practical option because the fittings are on rubber hose.
Thanks in advance, Dan

Old and weathered sounds like they need replacing .
I often cut the line and use a 6 point socket on the nut .
I also like Channel lock 410 pliers they have been great on stubborn flare nuts and bleeder screws.
As far as penetrating oils , I have found over the years its all just psychological support.
I will often with careful trigger control give stubborn connections a rap with the air impact gun.

 

[dansawyer]

Thank you all. I appreciate the thought and scope of information. I have found a set of crows feet, I will start with penetrating oil and 'carefully' test them.

 

[K30]

Called, appropriately enough, "flare nut wrenches". They aren't really particularly rare or expensive.

Caveat: Good ones are. Cheap ones suck and will still round off fittings. Snap-On's are particularly decent.

 

[Firstram]

Caveat: Good ones are. Cheap ones suck and will still round off fittings. Snap-On's are particularly decent.

The only Snap-On tools I own!

 

[Eddyde]

I've made my own flare nut wrench by cutting out a section of a box-end wrench.

 

[gard]

I have sometimes used a vice grip pliers that is designed to clamp on 3 of the flats, they seem to work well but need a fair amount of clearance around the fitting. Have not had great luck with the cheepo flare nut wrenches.