Gas Fitter Practice Test 2026 - Free Gas Fitter Practice Questions and Study Guide

A natural gas service regulator is typically designed to reduce the pressure of natural gas supplied from the main line to a safe and usable level for household or commercial appliances. The standard range of delivery pressure for residential applications is about 7 inches of water column (W.C.), which is a common measurement used in the gas industry to express low gas pressures.

Setting the regulator to deliver pressure from pounds to 7 inches W.C. means it is configured to handle an initial pressure from the main supply (which may be in pounds per square inch) and reduce it down to the safety and operational level required for appliances. This ensures that the appliances receive the correct gas pressure necessary for efficient and safe operation.

The other options involve pressures that either exceed the safe operational limits for typical appliances or use ounces as a unit incorrectly for standard residential applications, leading to insufficient appropriate pressure regulation.