The pre-filter nut is a key fastening part that holds the pre-filter lid on the body of the Espa Silen I and Blaumar I1 pump. The original design guarantees a precise fit and a long-lasting tight joint.
Replacement is simple and does not require professional tools – simply remove the worn nut and replace it with a new one. Suitable as a preventive replacement during annual pump maintenance before the start of the pool season.
We recommend replacement whenever cracking of the thread is evident or re-sealing is not enough to prevent water leakage.
