metallic flexible hoses reduce pipe wall noise transmission, prevent pipe fatigue, simplify alignment problems and reduce equipment flange stress. Hoses are manufactured from annular corrugated 304 stainless steel tubing covered by a tightly woven 304 stainless steel braid. The corrugations are very close pitched for maximum flexibility. Type nf is braided stainless steel with copper sweat ends and are u.l. Approved for refrigeration service.