[pappa p]

We have a single handle hot cold water shower mixer that is not a moen delta or kohler has a red and blue plastic adjustment ring inside can't get hot enough water ideas

[ballengerb1]

Can you post a picture? Shut off the supply and pull the cartridge or ball. Most plumbing supply houses will recognize parts and be able to help you. Big box store often have clear pachaging so you can try there too.