Big Blue Housing O-ring
This O-ring is used on the big (4.5 inch) blue filter housings used on most all of the BaitMaster+ live bait systems.
However, some filter housings require a special o-ring.
How do I know which o-ring I need?
When you are needing to replace an o-ring on your Big Blue Filter Housing, it's important to know which housing you have since each uses a slightly different o-ring.
More often than not, your filter housing will be a Pentair. If this is the case, you will use this standard o-ring. If you have a Flowmatic, you will need this o-ring: Flowmatic O-ring.