1.5" Tri-Clamp x 1" Female NPS

1.5" Tri-Clamp x 1" Female NPS Strait pipe thread. 

Tri-Clover compatible. 22MP  Confirm Tri-Clamp sizing here.

This fitting does not have a ground terminal. If you choose to use this for a water heater element, you must provide for a ground and a cover for the element connections.