Bought these to replace some 16 year-old Rain Bird sprinkler heads that had stopped rotating. They are an exact match. If you buy them, make sure you also get the special Rain Bird screwdriver (about another 14 bucks) that you need to install the nozzle and adjust the spray pattern. Since I couldn't unscrew the whole sprinkler body from the underground connection, I ended up just swapping out the internals (instructions are on YouTube) and that worked fine. They come with multiple nozzles, so I was able to take the opportunity to improve the coverage in one section by using a different nozzle from the one in the original unit.