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I am trying to tap into the 1" PVC main service line

So I installed the threaded compression tee. But the 1" main sprinkler pipe which connects to the outlet of the tee, keeps popping out of...

Thank you for all the advice.

I didn't know you can mix 1" on the main line and use 3/4" on the zones. This makes sense so that's what I will go with.

I am excited installing a sprinkler system for the first time. This will be a big challenge for me.

I have just started collecting data and already have a question, what size pipe I should use....