Broken MTA in Filter Head - Help???

Welcome! :wave:

Probably that's threaded and not glued in, except maybe with hardened teflon paste. That broken piece looks like a threaded adaptor.

Get a chisel or a trowel or some other piece of thin hard metal and heat it up and push it into the pipe section so you've got a bite. Then try turning it with a crescent wrench and see if it will unscrew.

The other option is to get an oversize coupling and a reducer and glue the coupling to the outside of the valve. Usually they're dual-sized; 1.5 pipe internally, 2" pipe externally.
 
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