Clogging Indicators For Suction, Return–Suction and Return Filters Optical, electrical, optical/electrical Response/ Switching pressure up to 2,5 bar Connection G 1/4 resp. M12x1,5 Clogging Indicators For Pressure and High Pressure Filters, flange mounting, optional with 2 switching points resp. temperature compensation Optical, electrical, optical/electrical Response/ Switching pressure up to 6 bar