Equal and reducing Bulkhead Elbows with a flange and NPS threads. First Barb size is on the outside of the panel the second is inside the panel. Available in Nylon, Polypropylene and PVDF. Thread sizes available are: UNF 10-32, 1/4-28 and 5/16-24. NPS thread sizes are: 1/8” and 1/4″. Barb sizes are: 1/16”, 3/32”, 1/8”, 5/32”, 3/16” and 1/4″. (order as NN, PP, PVDF)