Spare part suitable for most domestic water installations at 230V. You will receive a mechanical pressure switch designed for use with domestic water systems, expansion tanks, or garden water pumps. AC pressure switch with infinitely adjustable switch-on and switch-off pressures. This is a single-phase pressure switch that simultaneously controls phase and neutral. The device automatically starts the pump based on water pressure levels. When the pressure in the water circuit drops below the set start point, the pump activates and stops again once the desired pressure is reached.Pressure switch adjustment instructions: 1. Loosen the differential nut (2) 2. Adjust the start pressure (1) 3. Tighten the differential screw (2) to set the stop pressure Note: If your pump has a power rating exceeding 1.1 kW, an external contactor or standard power relay (available separately) must be installed upstream. A 380/400V three-phase pump requires a compatible 380V power connection.Product specifications: - Model: SK-9 - Voltage: 230V, 1-phase - For use with domestic pumps, well pumps, and water system controls - Reference number: 50622 - WEEE Registration Number: DE45283704 - Quantity: 1 piece - Material: Metal / Plastic - Color: Black - Protection Class: IP44 (splash resistant) - Input Voltage: 220–240V - Maximum Current: 10 A - Connection Size: 13 mm (1/4 inch) - Operating Temperature Range: 0 – 55°C - Maximum Operating Pressure: 6 bar - Pressure Adjustment Range: 1.4 – 4.1 bar - Start Pressure Adjustment Range: 1.4 – 2.8 bar - Device Type: Pressure Switch - Plug/Connector: Not included - Pump Control / Pressure Switch: Max 10 A, Single Phase - Weight: 0.376 kg - Package Dimensions: 105 mm (L) x 65 mm (W) x 110 mm (H) Availability: Ships immediately, delivery within 3–5 business days. Shipping: Package delivery