Polaris G-15 Ground Clamp HD 2 1/2-4 IN w/Adptr
https://nsiindustries.com/product/polaris-g-15-ground-clamp-hd-2-1-2-4-in-w-adptr/
Polaris grounding and bonding products provide flexible solutions for a wide range of grounding and bonding applications in the field. Uses include attaching grounding conductors to rigid conduit on different sizes of water pipe.