Water Pump Piping restrictions

Artum Snowbird wrote:
I am considering putting in flexible metal piping that is used in domestic sinks to try to prevent the shock/hammer from the Shurflo water pump.

But the interior size of the piping seems to be about 3/16 of an inch or less? I can buy an adapter that changes the fitting from 3/8 I think wall valve to 1/2 inch NPT, but will my flow rate really be affected?

Even if I go to the Revolution Shurflo pump, I still think the flexible lines will help.. what do you say?

Most if not all the hammering is caused by pump vibration radiating into the pump output hose but there's a simple solution that's far more effective than what you're proposing - dramatically extend the length of that hose with soft potable water hose. Sure, isolating the pump itself by mounting it atop foam, wrapping whatever water lines you can get to with foam pipe wrap, and tying down any lines that may want to contact an adjacent wall panel or the floor are all steps that will help minimize the racket but extending the length of the output hose is in my experience the most effective way to silence that water pump. Here's a series of 3 pics and a video which illustrate just how effective this has been in my own trailer.