I recently bought a similar set of regs from a local guy. After doing some research I contacted zeagle who advised the vx10 was exactly the same as the tech 50D. Apeks made them for both zeagle and beuchat. They recommended going to a US Diver/ Aqualung dealer for service since they now own Apeks. That's just for the vx10 though not the 1st stage or the VS octo.