Description

The Pentair 76033, also written 076033, is the replacement tank clamp knob for PacFab Nautilus and Nautilus Plus DE filters and the Purex 4000 Series molded DE filters. The source describes it as the part for units built after 1999.

What the knob does

A DE filter tank is two halves held together by a band clamp. The knob is the threaded handle that draws that clamp tight. It gets turned every time the filter is opened for a tear down or a grid inspection, and that is when it strips, cracks or snaps off.

Fit it before the system runs

A tank clamp that cannot be properly tensioned is not a cosmetic problem. The filter operates under pressure and the clamp is what keeps the halves together. If the knob is broken or the threads are gone, replace it before the pump is started again.