WHAT IS IT? Team Construction employees prepare a new natural gas main for installation on Terrace Avenue on Thursday morning, June 25, 2015.

Electricity flowed through a cable, heating up a black plastic sleeve between two bright yellow sections of a gas main on Terrace Avenue on Thursday morning, June 25, 2015.

The new line replaced the former cast iron gas main — part of a citywide project involving Liberty Utilities and contractors Team Construction, Liberty Utilities construction operator Doug Johnson said.

The new main was on its way to its new home about three feet below street level. Employees have worked on the Terrace Avenue project for about one month, Johnson said.

This week’s heavy rainfall washed away some of the soil, but Team Construction employees were making good progress.

“They’re good at getting everything in and are very professional at what they do,” Johnson said.

Reach reporter Trevor McDonald at trevor.mcdonald@courierpost.com