Hayward Bypass Kit, Old Style Header | HAXBPK1931 Patio Furniture Replacing it ensures the heater

Replacing it ensures the heater can be safely emptied before freezing conditions

cascading spill along the pool edge

Practical use

Hayward manufactures automatic pool cleaners and internal drive components used in residential systems

and DIY setups that require reliable replenishment of total chlorine reagents

Hayward Bypass Kit, Old Style Header | HAXBPK1931 Patio Furniture Replacing it ensures the heaterWhat This Part Is Used For The Hayward HAXBPK1931 Bypass Kit is used in H Series heaters with an old style header. It regulates water flow through the heater to maintain proper operating temperature. Why This Part Matters A worn or damaged bypass can cause overheating, scale buildup, or reduced heater efficiency. Replacing the bypass kit helps maintain correct internal water flow and protects the heat exchanger. Proper flow control is critical for