Product review (4 stars): Heavy duty work hoses.
I use these to purge boiler systems. The inside diameter is very small; probably 3/8" at the most. But I love the ruggedness of the stainless steel. Hopefully they will hold up longer that the garden hose variety. Four stars because 1/2" is never 1/2"; always way smaller. Just something that has always irritated me about sizing.