Ultra Spring Door Closer, Butterfly Spring – $1.30 at Amazon

Ultra Spring Door Closer, Butterfly Spring – $1.30 at Amazon
http://www.amazon.com/dp/B002TC8B30
Great for homes with children and pets, this Butterfly Spring keeps the doors closed that you need closed. No need to worry about someone not shutting the door behind them, or animals weaseling their way into rooms where they’re not welcome. This product is nearly universal, fitting and working on all your standard doors in almost any location. You simple extend it, with the spring part around the hinge, and it’s ready to do its job! Complete with rubber bumpers, you don’t even have to worry about wall or door damage.
http://www.amazon.com/dp/B002TC8B30