My breaker box is full and I need to install a 220v 20a breaker. Is there one available that would fit into a single slot in my breaker box? I could pull out the dishwasher breaker and use that spot if there is.

Need to know the make and model number of your panel.

There should be a label on the inside of the door of the panel.

It will tell you the name and model number.

There will also be a list of model numbers of the type breakers the panel can accept.