Replacement Main Lid Seal for Fish Mate 2000, 3000 PUV and 3000 PBIO Filters

A tired lid seal shows up as a weep around the rim once the pump is running and pressure builds. Fit a new one at the annual service rather than waiting for it to fail properly. Fits the Fish Mate 2000 and 3000 PUV, references 266 and 267, and the 3000 PBIO, reference 271.