Pentair FSH/FNS/Quad Nut (194997Z) premier and this Pleatco version uses

and this Pleatco version uses the PIN3PAIR reference with C-3302 and FC-3751 cross references

and box configuration

The Nemo Power Tools HD speed trigger assembly is designed for compatible heavy-duty tool applications where variable trigger control needs replacement

25677-100-970

Inlet fittings are useful because they form the visible return point where filtered water re-enters the pool

Pentair FSH/FNS/Quad Nut (194997Z) premier and this Pleatco version usesFor a clean repair, start with the correct part. Pentair FSH FNS Quad Nut (194997Z) addresses a specific service point while preserving compatibility with the intended Pentair application. This replacement nut is used in FSH, FNS, and Quad filter assemblies where proper hardware tension keeps internal parts secured. It is useful when the existing component shows wear, damage, age related failure, or performance issues in the larger pool or spa system.