Raypak 407A Uncommon Refractory Kit (010083F) pleatco and FC-9820 reference give this

and FC-9820 reference give this part practical value because DE grid replacements work best when the new component matches the original filter size and internal layout closely

Helps support proper hose connection in the cleaning setup

Fits compatible Kreepy Kadet and Model 186 applications

That kind of interaction matters more than many people realize because it is part of how the spa feels in normal day-to-day use

Raypak 407A Uncommon Refractory Kit (010083F) pleatco and FC-9820 reference give thisThe Raypak uncommon refractory kit is designed for compatible 407A heater applications where the supported refractory components in a specific uncommon configuration need replacement. A refractory kit is useful because it helps protect the internal 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, heat