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Discussion Starter · #1 · (Edited)
As part of my water improvement I am increasing all the lines into the house from the well to 1-1/4". The house currently has frost proof vacuum sillcocks with 3/4" inlet. Both of them leak.

In the upgrade I am looking to replace one of the sillcocks with a 1-1/2" valve to use with forestry hose. The valve has NST thread so would acquire a 1-1/2" NST to 3/4" GHT adapter fro use with regular hose. Question I have is regarding back flow. Entrance into house from well is below grade. Valve will exit house about 4 feet above grade. Flow rate will be 20 gpm.

I can place a vacuum break on adapter but what is best option for the 1-1/2" valve which would make the entire assembly code. I'd like to do this in a way that won't introduce a lot of maintenance and service checks.
 

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Discussion Starter · #2 ·
I live in a rural area with fire department response time over 20 minutes if even that.

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