How do I repair a broken valve on tubeless wheel?

So the valve on my rear wheel snapped off, leaving me the ability only to let air out unless I use some pin to push down when attaching pump,

Looked into it and it appears I can replace the core???

Can this be done without taking the tyre off?

Grip the two little flat bits just below where it snapped and unscrew
Then just replace with a new after getting a shook at the price

You’ll need one of these: Valve

There is a core remover tool but needle nose pliers work just as well. Core is less at £2 if I recall. No need to take tyre off. You can squirt sealant in through the hole with a plastic bottle with a pointy end too, should you need to.

I’ll Be damned!!!! Pays to watch Youtube!

All over it, Cheers for the help!
Learning new things all the time!

Take the wheel to your local tyre place with a ‘packetofbiscuitsinlieuofpayment’TM and they’ll have the tool and a million and one perfectly servicable valve cores in their bin!