Compression style shower drains are made to attach directly to the home drain pipe. The type of compression shower drain you’ll need will depend on the size of your drain, which is measured in inches.
This type of drain is rated by the diameter of the pipe that’s required, and it would be advisable to adhere to the recommended size to avoid excess pressure on your drain. Compression drains are easiest to install when you have access to the pipe in the basement or crawlspace.