My doggie door is eclectically operated and activated by a magnet on the dogs collar, thus no wild critters in the house. It is pricy, but worth every penny when you have 5 dogs. solopetdoors.com
wa8yxm wrote:(Water does not compress, what compresses is the air cushion in the water heater, Thus providing the back pressure needed to shut it off.. If you really need to understand why it works I can explain but ... Well, enough typing already f...
