Yes, the valves are compatible with PEX pipes. The product description states that the valves have a 1/2" nominal compression inlet that can be connected to copper, PEX, CPVC, and PE-RT pipes.
The product information does not explicitly mention if a plumber is required for installation. However, it states that the valves are easy to install and feature a compression installation type where you simply need to tighten screws to secure the connection.
