The EtherCAT variant of the P Series Drive (model numbers PD-04C, PD-10C and PD-35C) all ship from the factory with a Safe Torque Off (STO) bypass connector pre-installed. This allows users to set up the drive and do preliminary motion testing before they install it in their machine. Parker does not offer replacement bypass connectors for sale, but they can be purchased from multiple vendors online. The bypass connector is a TE Connectivity (formerly Tyco Electronics) 1971153-1. This part is carried by Mouser Electronics and Digikey, two large online electronics distributors. It is typically in stock and can be purchased in small quantities with a variety of cost-effective or expedited shipping options.
For reference, a diagram of the bypass connector is shown below: