Solenoid, Water/Methanol Injection, Stainless Steel, Nozzle 1000cc/min (800HP). Holley EFI water and methanol injection solenoids, when used with their other water/meth injection components and a Holley HP or Dominator EFI system, take your forced induction ride to the next level of performance! These solenoids are run by an injector driver output and are compatible with a water/methanol mix of up to 50 percent methanol.