What tool for this job? A plumber should know....

[Hummer]

Replace with stainless braided hoses. Just my $.02

Ordered and arriving tomorrow.

Glad you got it off, stuff in tight spots is always a pain in the ass to get off. I have been a solid channel lock guy for the last 22 years of doing maintenance, love made in usa tools.
With that said I got a gift card for menards like 6 months back and didn't know what to buy and got the 7in and 10in knipex cobras. They are a game changer they lock on and just dont let go and the heads are much smaller and can fit in to spots channel locks just cant fit in to. From the pict you posted pretty sure you would of been able to get the knipex pliers on and would of been able to spin that off. Just a thought for next time you getone of those situations.

Knipex are badass. Expensive but they work.

Those look really nifty, will probably get some 10 inch. I noticed there are many bad reviews with photos by Amazon buyers of the jaws or handles breaking. I'm inclined to think that Amazon is selling Chinese knock-offs.

Lately, I have much more confidence in eBay vendors on price, service and authenticity.