Stainless Steel Barbed Hose Fittings, 1/4'' npt to 3/8'' barb fittings for air hose or water, gas. Josaton 1/4 Npt to 3/8 Barb fittings are made of 304 stainless steel, so the stainless steel barbed fittings are highly resistant to rust, corrosion, scratches, dulling and prolonged wear and tear. 3/8 barb stainless steel fitting is compatible with PU hose, silica gel hose, rubber hose, and PVC tube. 3/8 barb to 1/4 npt barbed widely used in various applications such as gas, fuels, air tools, etc. Additionally, 3/8 inch hose barb fittings have extensive applications in households as well as in industries, agriculture, mining, road construction, firefighting, and aviation fields. NPT thread size is a nominal pipe size and it does not represent the actual diameter. Please measure your pipe by yourself first, to confirm whether this product meets your needs before purchasing!