The transparent pre-filter lid for ESPA Silen pumps of the new design (from 2007) is a shaped plastic sight glass that closes the pre-filter basket and at the same time allows visual inspection of its fouling without the need to open it.
The transparency of the lid is essential for monitoring the condition of the filter basket – you immediately see when it is time to clean it, without having to stop the pump.
A cracked, covered or clouded lid eliminates this convenience and at the same time poses a risk of water leakage or air being drawn in if it cracks under pressure.
Replacement is carried out by removing the lid nut, taking out the old lid and fitting the new one while checking the position of the O-ring seal in the groove.
The original ESPA part for the new Silen type is made of durable plastic resistant to UV radiation and chlorinated water.
