One-sided Bulkhead Elbow is tank mountable with a flange. It is available in Nylon, Black Nylon, Polypropylene, HDPE and PVDF. UNF thread size is 5/16-24. The NPS sizes are 1/8” and 1/4″. Barb sizes are: 1/16”, 3/32”, 1/8”, 5/32”, 3/16”, 1/4”. (order as NN, BN, PP, HDPE, PVDF)