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I need to change my main house shutoff from a gate valve to a ball valve. I have 3/4" soft copper coming in and 1" galvanized pipe inside. What is the best way to make this connection?
 

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Post a picture so we have an idea of the space involved---

Generally --cut copper,slowly ,so you are shaping the soft tube with your tubing cutter--

Sweat on a new valve--sweat on copper with a dielectric union on the output side---join onto the house plumbing.
 

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Why not replace the gate valve with a gate valve or replace it with a ball valve ? You need full flow through your main valve.
 
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