The correct tool for pump P5610/2 is:
✔ Marbed 9726 – Multi-Spline Tool for Simms/CAV Maximec Pumps
This tool has been verified as fully compatible with the pump shown in the photographs provided by the customer, including the spline profile of the delivery-valve retaining nut.
As usual, we recommend using only the designated Maximec-type tool to avoid damage to the valve holder or to the pump head.
If any users encounter similar identification cases, feel free to share your photos or questions here so that our technical team can assist with the proper tooling and configuration.