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What is the name of the mechanism by which you can open the front door without a key, just by pushing it inside? How do you install it?

I would like to replace the regular door latch with one with a small lever that can be set to open/close. So that you can still open the front door without a key just by pushing it open. I think you know what I mean. It doesn't have to be anything electrical, just the use of a lever.

Is it always possible. What should you be paying attention to?

I have a front door from Kebotherm and a continuous closing bar.

• germany
• door