The Eastman Steel-Flex gas connector is made of stainless steel with a yellow epoxy coating. The deep corrugations of the connector provide structural support against crushing, kinking and cracking. The epoxy coating is designed to withstand long exposure to household chemicals and harsh environments. This is a highly durable connector with zinc-plated steel FIP fittings. This connector can be used as a gas supply line in HVAC applications, water heaters, ranges, and other appliances. Works with propane or natural gas.