Does anyone know what shower valve is this?

[Macovei Nicolae]

 

[Geofd]

what does the trim look like

 

[Mr_David]

look for price pfister pressure balance.
That one has a brass extension

https://www.google.com/imgres?imgur...XcAhWlPH0KHRrdBLEQMwikAihcMFw&iact=mrc&uact=8

 

[SHR]

Mr_David nails it again. For sure Pfister. Call their customer service line and they will send you a new cartridge. Remove and re-use the brass extension from your current cartridge.