Stauff SPAL 6060.3 PP DPAL IS M W12 Drukschakelaars 6005003243 blank filter Element 6005003243 Clogging Indicator visual electrical Voltage 24V Differential Pressure 2 bar Differential Pressure: 2 bar 29 PSI 3mm Polypropylene W12 Cover Plate Socket Cap Screw Weld Plate