1/4" FCM (Female Compression) x 1/4" FCM stainless steel fittings with washers for secure connection ; Braided stainless steel resists punctures, crimping & kinking ; Stainless steel couplings & brass stems provide secure connections ; Clear vinyl surrounds flexible & durable PVC inner core tubing that's woven with polyester for added strength under pressure ; Lead-free ; UPC (Uniform Plumbing Code(R)), NSF 61 & 372 (National Sanitation Foundation) & CSA (Canadian Standards Association) certified ensures product safety ; Durable design protects against bursting & cracking ; 5-year warranty;