Pentek SH144368, Spanner Wrench SW-4 for #20 Big Blue Housings
- Used on 20" or #20 Big Blue Housings
- Does not fit properly on 10" or #10 Big Blue Housings
- Spanner Wrench SW-4
- Use to Loosen Sump when Changing Filters
- Spanner Wrench SW-4
- Use to Loosen Sump when Changing Filters