Rain Bird 212468 SAM/Hydraulic Case Assembly for 500 and 700 Series Rotors - This SAM/Hydraulic Case Assembly is for use with Rain Bird 500, 550, 551, 700 and 751 Series Rotors. Made for easy installation and use, this assembly will help ensure the best service life possible. Rain Bird rotors are engineered to deliver a low precipitation rate, so you can cover more area over a longer period of time.