Hose barbs are used with flexible tubing and the barbs grip the inside of the tube to create a seal. Use these nylon fittings for applications like water lines to tanks, garden hoses, lab equipment and more. This product is corrosion resistant, durable, lead-free and manufactured from NSF 51 and NSF 61 compliant material. This item is registered in Mass. 1-piece per bag A-497 Use with hose clamp for extra security Barb id measurement is for the hose NSF 51 and NSF 61 compliant material Reusable Use with flexible tubing for water lines to tanks, hoses and more Pair with a hose clamp for a more secure fit Not recommended for underground use