Stainless Steel Barbed Hose Fittings, 3/8" NPT to 1/2" barb stainless hose barb fittings. Whether you're a professional plumber or someone who likes to do their own remodeling, this accessory kit is ideal for you to create fulfillment in your field! 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!