I replace about 30-45 a year on my system. I now use the K-5 series or model sprinkler and they do fine but it sure seems like the gear driven fails first. My system has 9 zones and have around 25-30 sprinklers per zone and it runs everyday for 30-60 min per zone from 4-25 to 9-25. is there a more durable sprinkler to use or do they just wear out?? Its ground water at around 65 psi i think
