The pre-filter cover nut is a spare part for ESPA pumps of the NOX and Iris (new type) series, which serves to securely fasten the transparent cover to the pre-filter body. A correctly tightened nut prevents water seepage and loss of pressure from the pre-filter.
The part is made of durable plastic certified for contact with pool water and chemicals. A damaged or cracked nut can cause water to leak beneath the pump and reduce suction, leading to cavitation and pump damage.
Replacement is simple and requires no special tools – simply unscrew the old nut and fit the new one. The original part guarantees the correct thread and a precise fit on the body of the ESPA pump’s pre-filter.
