installation For Models: 678-1419 fip " !i! ADD-ON SHOWER UNIT INSTALLATION INSTRUCTIONS PLUMB WORKS® TOOLS NEEDED FOR INSTALLATION: Read instructions before installation! Depending on your installation, you may require the following supplies: Wrench or pliers, rags, pipe compound or tape. When using wrench or pliers, always protect finishes by wrapping parts with a cloth. 1. Tum off water supply before beginning installation.