Powered up the fresh water pump and found the inline value leaking from the freeze. Assume easy to fix and replace. Anything I should know?

It's a 12V valve, which can be hard to find these days (newer sprinkler systems are 24V).  You may need to harvest the solenoid and transplant it.

Mike R may have a better valve suggestion...

The last one of those that I had to replace I had to go with something like this:
SparkFun 12V Solenoid Valve - 3/4": Industrial Solenoid Valves: Amazon.com:...

The old style like the one in the the pics. are NLA. The new ones have a different bore...

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What would we do without Mike?   

with the 3/4 you won't have the restriction that you have in the 1/2"
Nigel, you might want to think about taking the gray pipe out and replace with pex--my experience with the gray--it is a leak waiting to happen!
Chris

I used the SparkFun solenoid valve, it works fine. It has a built in screen so it cn get clogged up but the screen protects the valve.  Good idea to use a particulate filter for all incoming water.

Lots of neat stuff at SparkFun.


This valve takes...

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Mike, thx for the link to that valve. I just ordered 2 of them so will incorporate one in my water line. Thx as usuall
Johnh