Raypak R405A/R405B Uncommon Refractory Kit (005286F) divertorvalves Replacing the volute back is

Replacing the volute back is often the right step when the rest of the pump remains serviceable and the structural weakness is isolated to the rear housing support

This replacement is especially useful when the original frame is cracked

A cabinet panel is useful because it helps protect internal components while also preserving the finished appearance and structure of the heater cabinet

Correct fit matters in control-system parts because a cover should sit naturally and feel like part of the original equipment layout

Relays are useful because they allow a lower-level control system to operate higher-load circuits through a dedicated switching component

Raypak R405A/R405B Uncommon Refractory Kit (005286F) divertorvalves Replacing the volute back isThe Raypak uncommon refractory kit is designed for compatible R405A and R405B heater applications where the supported refractory components in a specific uncommon configuration need replacement. A refractory kit is useful because it helps protect the burner area from heat exposure while supporting the intended combustion environment inside the heater. This replacement is especially useful when the original refractory material is cracked, crumbling,