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Only one is needed in this unit.
Depending on how frequently the blender is used. The Sealing Ring can become brittle and cracked or compressed so that it will not create sufficient seal to keep the contents of the jar from leaking out of the bottom. If you use your blender often, it may be a good idea to order more than one at a time, so you won't have any down time with your blender.
The purpose of this item is to hold the blade and seal in place at the bottom of the blender jar
Because it has plastic threads they will wear at times and the jar will leak.
Over tightening may crack this part, dropping it may break it and excessive heat may warp it.
Once you have this off, this is a good time to check the sealing ring to see if it is not cracked or if it has been compressed too much.
This is the new round Jar design.
If you have the old style Jar, you will need to order the part numbers, 124462-000-090 Jar Cover & 050613-002-089 Filler Cup.
This Decanter is used for the Oster model number BVST-JBXSS41 Coffee Maker.
It includes the handle and the Decanter lid.
It has a 12 cup capacity.