Material:Pure copper coil + flame retardant material
DC 24V 1/4" Quick connect Solenoid valve.
Turn on water when system start;and cut off water when system stop.
It will become hot because there are so many coils inside. Its normal and safe phenomenon. The highest working temperature of this product reaches 60C. If you want it works long hours, you should find a N/O normally open solenoid valve.