I have been concerned that my water pump was going to fail for the last couple years. I a conversation with Headhunter they told me the pump I had in my Royale was way past its normal life and expect trouble. It started dripping from the front seal and it was time to switch.
I was told that the MACH 5 pump was a dead replacement, its not. The inlet is 90 degree from the old model and the discharge is higher.
After getting a new one on Ebay for less than half, I did the job. Love the new pump, more pressure and super quiet. If you own a Royale maybe my installation will give you some idea's. need to paint the PVC and its good to go.