uncleskeeter, if you mean a replacement control box or clock, the short answer is "yes" for the typical homeowner devices. Just make sure that the replacement clock has enough contact points for all the zones you have at present and even a couple more in case you will need them as you add to your system. You will want to ensure that it has the 'pump start' contact and fuse protection. Find out, before you buy, whether you will need a dedicated relay switch or not. The difference is in the voltage required and has hair-raising implications.