Hello, we are sorry for the confusion regarding the SharkBite 1 in. PVC IPS End Stop. This fitting is intended for PVC pipe as it goes by IPS size (Iron Pipe Size) which is a different sizing standard than PEX and copper adhere to. The fitting that would work for 1 in. Copper or PEX would be The Home Depot SKU # 202270533, which works on Copper, PEX, CPVC, and PE-RT pipe. We encourage you to reach out to our Customer Service Team at 1-877-700-4242 for further questions so we can help.