Different manifolds require different tools. If you are using a HydroPEX Crimp Copper Manifold, you have two choices for your tool- either the HydroPEX Clamping Tool or the Watts Crimping Tool. Both of these tools are used with HydrdoPEX fittings but require different rings to make the connections (stainless steel for Clamping and copper for Crimping).
PEX Tools, Manifolds, and Fittings can be found at www.supplyhouse.com