CMP Union [1-1/2" MPT x 2" Slip, Self-Sealing] (21063-180-000) astral and this Grasslin Diehl panel-mount

and this Grasslin Diehl panel-mount version is a 115 volt SPDT model using the FM1SWUZ-24U reference

Unlike a generic cable

Useful when replacing a damaged or unresponsive topside

Helps regulate internal water flow through the heater

CMP Union [1-1/2" MPT x 2" Slip, Self-Sealing] (21063-180-000) astral and this Grasslin Diehl panel-mountThe CMP Union [1 1 2" MPT x 2" Slip, Self Sealing] is a practical replacement union fitting for service work where matching the original configuration matters more than making a broad, generic substitution. It is used in plumbing service areas where matching the connection type and size is critical for leak control, easier equipment access, and a cleaner repair. Key identifying details from the listing include 1 1 2" MPT x 2" Slip, Self Sealing.