The old faucet in my bathtub does not give hot water. I tried to repair but don't know what is its brand name. I attached a picture of the cartridge. Please tell me what to do and what type of cartridge is and where I can buy it. Thank you so much.

Take it to pumbing supply and the will help you with the parts, or wait may be one of the experts may know the type and help where to get one, good Luck.

John