Plumbing question. I think I found an answer. Depends on the size of the main pipe, but a typical installation of a major copper to 1 "would aboout 2-3 hours if there is an easy and available access Depending on where you live work will vary but a rough estimate woul be 70. – 90 per hour, plus the cost of parts. Here is a link to a website plumbing supply parts that shows the cost of different size regulators and costs each. Most common He is a 1 ", which will a cost of about $ 70. 00, but must wait for the plumber to check prices in the parts. Hope this helps.