The Coil (OEM Part No. 3217999721) is an electrical spare part compatible with Epiroc underground mining equipment, including E70, M4C,Simba E7C, Boomer XE3C, Boomer 291, S7D, Boltec-MC, Boltec-S, Boomer S2, BOOMER-M2C, S1D and T1D New models. Manufactured from copper coil material, it functions as an electromagnetic control component installed in the solenoid valve assembly. The coil generates electromagnetic force to activate hydraulic valve operation and ensures accurate machine control. Designed for demanding underground mining environments, this replacement electrical component provides stable performance, excellent durability, and long service life for drilling and bolting equipment maintenance applications.