Hayward PS-16 Expansion PCB (GLX-PCB-EXP) littlegiant Useful when the original drain

Useful when the original drain components are worn or leaking

A union like this is useful because it gives the system a removable plumbing joint that can simplify maintenance

Improves fit confidence and long-term cleaning performance

or no longer seating correctly in the wet end

Hayward PS-16 Expansion PCB (GLX-PCB-EXP) littlegiant Useful when the original drainExpanding a Hayward PS 16 automation system requires the right board to add control capacity cleanly. This expansion PCB is designed for compatible Hayward control applications where additional equipment, features, or circuit management is needed. For pool and spa systems that have grown beyond the original control layout, an expansion board can help organize new functionality while keeping everything tied into the automation platform. It is a