Oase BioMaster Prefilter Gasket, Replacement Part

This is a replacement prefilter gasket for Oase BioMaster and BioMaster Thermo canister filters. A fresh gasket helps the prefilter seal during servicing.

• Fits BioMaster Thermo 250, 350, 600 and 850
• Also fits BioMaster 250, 350, 600 and 850
• Genuine Oase replacement part

Check that the gasket sits flat in its groove before reassembling the filter.