Pentair PacFab ST Air Relief Strainer (191329) nipples The secondary control point is

The secondary control point is often there to make common adjustments easier from a certain seat or side of the spa

The 7/16 inch cross-section gives this O-ring practical value because extra-large sealing surfaces often require significantly more material than standard profiles can provide

Supports a cleaner and more dependable finished result

This part has practical value because the spigot connection style helps preserve the intended plumbing fit for supported installations

Pentair PacFab ST Air Relief Strainer (191329) nipples The secondary control point isDesigned for service focused pool equipment repairs, this air relief strainer helps restore the fit and function of the related Pentair PacFab assembly. For technicians and homeowners working on ST sand filter systems, this piece helps keep the repair focused, efficient, and closer to the original equipment configuration. The 191329 component supports sand filter service where internal positioning, air relief, or media flow can affect filtration