For attaching 3/8" ID clear vinyl tubing to a 5 gallon bucket. Drill 1/2" hole in bucket approximately 1.5" from outside bottom of bucket. Coat the convex base of the barb with E6000 and press firmly through hole from inside the bucket. Spin the barb in the hole to evenly distribute the E6000 between the base and the bucket forming a tight seal. Continue spinning until the fattest edge of the base is facing up. Allow base to dry before attaching washer so it won't spin as you position the washer. Coat the concave side of the washer with E6000, being careful to avoid the edge of the center hole. Carefully slide washer over barb (you don't want to get E6000 on the barb/bolt) and press firmly against the bucket. Rotate the washer to evenly distribute the E6000 between the washer and the bucket forming a tight seal. Continue spinning until the thinnest edge of the washer is facing up. Make sure both washer & base are flush, tight and oriented properly then allow to set for 24 hours BEFORE screwing the nut on. Do not over-tighten nut or you will break the seal, and your bulkhead will leak.
The original nut did not print out very clean. Use the files marked "v2" instead for clean-printing nuts.