TL;DR
A two-pound gas system is a residential fuel gas layout that distributes at 2 psi from the meter to a manifold, where a pounds-to-inches regulator steps pressure down to the appliance level of about 8 to 11 inches water column. Running the trunk at elevated pressure lets it use much smaller CSST than a low-pressure system would need for the same BTU load, simplifying retrofits and long runs.
What it means
A two-pound gas system is a residential fuel gas layout that distributes at 2 psi from the meter to a manifold, where a pounds-to-inches regulator steps pressure down to the appliance level of about 8 to 11 inches water column. Running the trunk at elevated pressure lets it use much smaller CSST than a low-pressure system would need for the same BTU load, simplifying retrofits and long runs. The line-side regulator needs a vent or listed vent-limiting device, and every appliance downstream still sees ordinary delivery pressure.
Where it sits in the glossary
Two-pound gas system is part of the Trade jargon group inside the ProFix Directory glossary. Browse every term in this category from the glossary index.
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