RTS Home Accents Hose Barb Kit is the OEM kit for any of our rain barrels. The plastic hose barb allows for additional overflow valves. When used with Rain Barrel Link Kit, hose barb allows for multiple rain barrels to be linked together for increased capacity. Includes 1 plastic hose barb, 1 plastic lock nut and 1 o-ring parts for RTS Flat Back Rain Barrels, RTS Flat Back Dual Spigot Rain Barrel and RTS Eco Flat Back Rain Barrel