Hayward Water Pressure and Flow Switch | HPX2181 Pool Cover Reels Hach is a trusted name

Hach is a trusted name in water analysis with decades of experience serving pool professionals

HDPE Wicker: Offers a stylish look that resists fading and cracking

The brand's approach emphasizes compatibility across a range of skimming and circulation parts

Verify alignment before final tightening

Routine inspection during filter service often reveals housing fatigue

Hayward Water Pressure and Flow Switch | HPX2181 Pool Cover Reels Hach is a trusted nameWhat This Part Is Used For The Hayward HPX2181 Water Pressure and Flow Switch monitors circulation in compatible Hayward heater systems. It verifies adequate water flow before allowing the heater to fire. Why This Part Matters Low flow conditions can damage the heat exchanger if the heater operates without sufficient circulation. A malfunctioning switch may cause nuisance shutdowns or prevent startup. Replacing a failed switch restores safe operation