Square D - QOCRBGK1C 100 Amp QO Load Center Outdoor Generator Inter-Lock Kit

Easy install and a great value! I prefer this method rather than a separate transfer switch. Gives you more options with the circuits you want to apply power.

Stated seeing changes in my cycle in just a few weeks

Very easy to install

You can only use this product for its intended purpose, to chose which power source is suppling electric to your load center, and to prevent sending your generator power to the power lines and endangering someones life.