Hayward Universal H-Series Natural Burner Orifice (FDXLBON1930) circuitboards This generic K10 Series relay

This generic K10 Series relay is a practical option when a 12VAC

Raypak uncommon refractory kit

and PA50 references

A topside like this is useful because it gives the user direct access to system functions and settings from an installed control point rather than requiring interaction at the equipment pad

The probe size

Hayward Universal H-Series Natural Burner Orifice (FDXLBON1930) circuitboards This generic K10 Series relayDesigned for precise service work on compatible Hayward heating systems, Hayward Universal H Series Natural Burner Orifice helps restore the fit, sensing, flow, or combustion support needed for dependable heater operation. It is a practical replacement choice when an existing component is worn, damaged, or no longer performing as it should. Pool heaters rely on tightly matched internal parts to manage heat, airflow, water movement, and safety