High pressure controls with plastic plunger VDE 0660, EN 60947-5-1 These pressure switches operate with a plastic plunger, which is resistant to detergents, de-greasing and polish-removal agents. The FF 4-60 PAH ... FF 4-250 PAH pressostats are thus particulary suitable for use on high-pressure cleaning apparatus. Throttle screw H 115-115.001 is fitted as standard inside the pressure connection on these units. This must be removed for use with viscous media. Pressure connector: H (G 3 /8" female, DIN ISO 228/I)