Oatey 6 Pack 3/4" Insulated & Suspend Clamp. Oatey Insulating Pipe Clamps allow copper, PEX, and CPVC pipes to be secured to joists and rafters or through studs. Constructed of durable, corrosion-resistant polypropylene, these suspension pipe clamps feature a ribbed design that allows the pipe to cool faster and expand or contract freely. These clamps also isolate the pipe from the stud, helping to reduce noise.