Replacement O-ring for the pre-filter of the ESPA Flipper 1 1½" and Flipper NS pumps (part number ESPA 0000000304). It ensures a watertight seal on the pre-filter cover: it should be replaced if it is flattened or cracked, or if the pump is taking in air through the cover.
Approximate dimensions: Height: 13 cm. Bottom diameter: 10 cm. Top diameter: 12 cm.