Dixon TN32 Nylon Tuff-Lite Fitting, Nipple, 1/4" NPT Male x 3/8" Hose ID Barbed (Pack of 50) Nipple for connecting pipes and hoses of different types Hose barb on one end and male NPT threads on the other Nylon for strength, flexibility, and resistance to abrasion, crushing, and cracking Barbed fitting for a tight seal on hoses and NPT threads for a tighter seal than straight threads Made with material approved by the FDA