Morris Products 90630 Ground Pipe Clamp, For Direct Burial, 1-1/4 - 2" Water Pipe Range, 2 - 10 Wire Range, 5/16 -18 Screw Thread Copper Ground Pipe Clamps - Direct Burial - These Copper Electrical Ground Pipe Clamps are rated for Direct Burial Direct Burial Electrical Pipe Clamps are cast of high strength, High Conductivity Copper Alloy For Connecting Grounding Electrodes to Water Pipe, Copper Tubing or Ground Rod Commonly used for Swimming Pools, Commercial, Industrial & Agricultural Applications UL Direct Burial Ground Pipe Clamps have Screws made of Copper or Stainless Steel