Raypak 406A/407A Indoor Stack Kit (009841) pentairpool A replacement pack like this

A replacement pack like this often improves more than one part of the spa experience at once because it sits at the center of everyday operation

Designed for compatible pump electrical connection applications

The 21058-000-000 is a practical service part when a compatible system needs a union to restore dependable plumbing-to-hose connection support

That helps restore heater control with a direct-fit service part

Keeping the plumbing style consistent can reduce service complications and help the replacement stay closer to original equipment intent

Raypak 406A/407A Indoor Stack Kit (009841) pentairpool A replacement pack like thisThe Raypak indoor stack kit is designed for compatible 406A and 407A heater applications where the supported venting setup for an indoor installation needs replacement or completion. A stack kit is useful because it helps create the intended connection between the heater and the indoor vent path, supporting cleaner exhaust handling and proper fit. This replacement is especially useful when the original venting components are incomplete, damaged, or no