PEX clamping uses the same fittings as PEX crimping, but different rings. The stainless steel clamp rings perform better outdoors and in direct burial applications than copper crimp rings do. The heavy duty clamp tool offered at SupplyHouse.com performs better for contractors and people who clamp frequently. The tool also cuts clamp rings off of PEX. Just push the silver pin down on both sides and insert the tool into the collar of the clamp ring.