The seal under the pre-filter basket lid is an O-ring measuring 151.7 × 6.99 mm designed for Victoria series pool pumps.
A correctly fitted seal prevents water from leaking out of the lid thread and keeps the system in the pressure balance essential for the pump to function correctly.
A cracked or deformed seal manifests itself as a visible water leak at the lid or as a drop in suction, which causes air pockets in the pump.
Replacing the seal is a simple and inexpensive preventive procedure that is recommended whenever cleaning the pre-filter basket or after winter shutdown.
