How can I tell the difference between Corrugated Stainless Steel Tubing (CSST) and a Flexible Appliance Connector (FAC)?
Wednesday, June 20, 2018
Both CSST and FAC are corrugated stainless steel pipes used to transport natural gas or propane. Because each has different limitations, it important to be able to determine which one you are looking at. Corrugated Stainless Steel Tubing (shown above) has a sheathing over the pipe, which is usually yellow or black, and the corrugation is only visible at any gaps in the sheathing at pipe connections. A Flexible Appliance Connector does not have sheathing. It is painted and the corrugation is visible.
Here’s a few other differences between them:
CSST - is designed to be installed permanently and secured in place at regular intervals. It is not rated for connection to moveable appliances, such as a range or clothes dryer. Corrugated Stainless Steel Tubing may be installed directly to a gas meter and run through walls or into an appliance cabinet, but must be bonded.
FAC - is used only as the last section of pipe that connects to an appliance after the shut-off valve. It must be replaced when a new gas appliance is installed and is limited to 6 feet length. Only one Flexible Appliance Connector, like the one shown below, is allowed per appliance. The entire length must be visible, so it cannot enter the cabinet of an appliance or run through a wall. FAC will tolerate occasional movement after installation.
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