Pentair 520818 COM Port Expansion Module with 1-Feet Cable Replacement Pool and Spa Automatic Control Systems COM port expansion module replacement Fits Pentair IntelliTouch, EasyTouch pool and spa automatic control systems Also fits Pentair Compool to EasyTouch upgrade automation systems Measures 14-1/2-inch length by 12-1/2-inch height by 13-1/2-inch width