Email: wh2ldigital@gmail.com
Write to us if you find an error, have a manufacturer document we should cite, or have a cartridge question we haven't covered. If you're asking about a specific valve, include the brand and model number if you know it, what the handle does (rotate only, or pull and rotate), and the length and width of the old cartridge.
We can't give on-site plumbing advice. For a damaged valve or a leak inside a wall, call a licensed plumber.