3/4 Inch MIP x 3/4 Inch FIP x 60 Inch Long Gas Appliance Connector Thrifco Plumbing 4406697 7/8 Inch x 60 Inch Yellow Gas Flex. The coating gives it extra protection against corrosion when it comes in contact with chemicals that are typically found in households.Yellow coated polymer exterior & double corrugated for extra protection and flexibility.