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choosing the PPM4 system gives you more chlorine production headroom than a smaller model
manufactured to exact factory specifications for proper calibration
This replacement helps maintain consistent solar cover handling
Durable construction resists corrosion and wear in pool environments
This replacement restores full spa circulation and reliable bubble action
Raypak Refractory Set, Front & Rear, for Model R405 Heater | 005286F Aluminum choosing the PPM4 system givesRaypak 005286F Refractory Set R405 Front & Rear Heater If the combustion chamber in your R405 heater shows cracked refractory, visible hot spots, or signs that heat is no longer being contained the way it should be, the refractory set deserves close attention. Once the front and rear sections start breaking down, combustion heat can stress nearby components and the chamber no longer behaves the same under load. This refractory set replaces the front
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