This fits my thankless water heater perfectly and was almost 12 the price of other similar hoses it is rated way higher buts than my tankless water needs which is great mip and fip fittings and easy to install diy saved money

Its a pipe it carries gas or whatever and its flexible excellent quality hard to find locally must have part for your higher btu tankless water heaters once you have this flixible gas line you can do the replacement yourself solid co