Potterton Air Pressure Switch 642236Potterton air pressure switch is a safety device which checks that the fan is fully operational. It ensures that, if the fan fails within the boiler, there will not be a build up of toxic gases with no means of venting them. AIR PRESSURE SWITCH FOR: POTTERTON SUPRIMA 30 POTTERTON SUPRIMA 40 POTTERTON SUPRIMA 50 POTTERTON SUPRIMA 60 POTTERTON SUPRIMA 70 POTTERTON SUPRIMA 80 POTTERTON SUPRIMA 100 PART NO.: 642236 642227 BRAND NEW

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