Vinyl supply tube. 3/8' compression thread (supply valves) x 1/2' F.I.P. (faucet shanks).Flexible hot and cold water connectors with solid brass inserts. 2 layers of specially formulated NSF and FDA approved polymer is reinforced with tough polyester braiding to create a flexible, reliable, and kink-free tubing with ample flow for all modern appications. Do it flag labeled. Bulk flexible hot and cold water connectors. Complete and ready-to-use. No washers, rings, inserts, or sleeves are ever needed. Speedi Plumb's unique flexibility prevents any crimping or water blockage. Outside is made of polyester-braid reinforced PVC for extra long life. Inside is a nontoxic, synthetic polymer lining which withstands water temperatures from 5 deg. F. to 230 deg. F. FDA certified for safe drinking water. All bulk Speedi Plumb water supply connectors are now provided with color coded flag labels - yellow for toilet hook up, green for faucet hook up.