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There are several diameters of skimmers in circulation.
Measure the outside diameter of the suction part. This is 23mm or 25mm.
Holders to replace existing holders or to convert the S (suspended) version to an H version.
This original rubber Oase Replacement seal for Oase BioMaster pre-filter fits the following models:
-BioMaster (thermal) 250
-BioMaster (thermal) 350
-BioMaster (thermal) 600
-BioMaster (thermal) 850
NO. 20
OAS-45149
This original Oase suction button fits the following models:
Oase BioMaster 250