Release Door with Auto Latch for our Original Feral Cat Series Traps and Cages. Release doors for our Gravity series traps can be found here: GRAVITY TRAP RELEASE DOORS. This easy release rear door does not require a locking clip or carabiner. To lock the door simply push down on the door until it shuts and it will automatically lock in place. To remove the door, pull the latch back and lift up on the door. Never again lose an animal after forgetting to latch the back door with a clip or carabiner, this door locks itself! Carabiners and manual clips and locks can also be difficult to operate, especially in cold weather when muscle strength is impaired. The auto latch is simple and easy! Auto Latch is built into the release door, both release door and built in auto latch are included with this purchase. This product ships for free in the contiguous USA via USPS.