QICKCLAMP 1/2"RING 100PK by ZURN PEX MfrPartNo QCLP3XNPK100 Compatible Pipe Material: Copper, CPVC and Polybutylene Fits For: use with Polybutylene, CPVC and Copper tubing Application: Ideal for Both Plumbing and Heating Material: Stainless steel End 2 Diameter: 1/2 in.