Pre-Filter Nut for Espa Silen S

The pre-filter nut for the Espa Silen S model is a threaded fastening part that presses the pre-filter lid against the body of the pump. Wear of the thread or cracking of the nut is one of the most common causes of water leakage in the pre-filter area.

The original plastic nut meets the manufacturer’s precise dimensional specifications and guarantees a reliable seal at the standard operating pressure of the pump.

During the annual preparation of the pump for the season, we recommend visually checking the nut and, in the event of cracking or wear of the thread, replacing it preventively.