The Einhell pre-filter 4173801 has an outer thread of 33.25mm and an inner thread of 25mm. Its robust design enhances water filtration, protecting pumps from debris. Ideal for garden irrigation systems, it ensures longevity and efficiency. https://elecena.pl/product/29045389/einhell-4173801-pre-filter-1-robust-protection-against-contamination 2025-07-02 https://elecena.pl/product/29045389/einhell-4173801-pre-filter-1-robust-protection-against-contamination 2026-07-13