Model NC0909 is the Neighborhood Cats “See Through" Rear Release Door. Designed to fool the smartest and most trap shy cats. The clear acrylic rear release door allows cats to see completely through the trap and gives them confidence to enter the trap believing they can walk through. Best if used in a natural funnel setting so the cat comes in the direction of the open trap door. NC0909 is designed to fit trap 606, 606.3 and other 9" wide x 9" tall traps with rear sliding door.