The Omnifilter OW1 Filter Wrench has been discontinued by Omnifilter.
The OmniFilter OW1 Filter Tank Wrench fits OmniFilter models CBF1, CBF3, CBF20, OB1, OT32, RO2000 (except for Series "B"), R12, R14 and SFM2.
This product is also known by part number OW1-R-01.