In many cases if a fire does occur as well as the valve closing, an electrical signal is required to notify a BMS, close an additional solenoid valve or set off an audible alarm. - We offer 3 kits for this eventuality. - Kit 1 contains a mercury switch which sits on the lever of the free fall valve, & a manual quick release. - Kit 2 contains an electro thermal link, a contactor & a knock off button, this would be used in conjunction with a solenoid valve to stop the oil flow. - Kit 3 is for outside where low voltage is required & contains an electro thermal link a knock off button & a panel with 24V DC PSU.