My system uses pipes of high density polyethylene rated 165psi and all joints heat fused together. The warranty is 55 years. The driller used these clips to spread the 3/4" pipes apart in the 4 3/4" bore for better efficiency. The grout tremie pipe holds everything in the center of the hole, and as the grout pipe is pulled out when filling, the geo pipes spread apart.
GBT Incorporated - Supplier to Geothermal designers, installers
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