here are some pictures of some hunter rotor sprinklers we replaced at one of our commercial accounts. the old rotors were Hunters PGPs. most of them were not working properly any more. so we decided to upgrade all 16 of them. we went with the Hunter I20 stainless steel and some 36SS. wow these rotors are awesome the best we have used yet. we have used the regular I20s, but the stainless steel are awesome and they will last a lot longer.