Culligan SW-2 3/4-Inch Housing Spanner Wrench Wrench for Inlet/outlet housing For use with Culligan Filter Sediment Water Filters HF-150 (1653-3333), HF-160, and HF-360 (1653-3325) This product is made in China Culligan Sales No.SW-2A 3/4" Housing Wrench The SW-2 wrench makes changing water filters easy. The SW-2 can be used with standard whole house housings.