The waterfall's two power cords allow for independent control of the LEDs and the waterfall pump. (petbusiness.com)
But if you do feel compelled to have a closed system pump with independent control for suction and speed and a huge discount, do buy from here. (electricbreastpumpwomen.com)
That gives the driver and the passenger independent control over heating and air conditioning. (articles.orlandosentinel.com)