We are offering stainless steel pipe fittings. Elbow 90 18" 4" featuresthe thread ends conform toasme b1.20.1(npt)din 2999 & bs21iso 2281 & iso 71 dimension conform toiso 4144sp114en-10241jis150 lbs material conform toastm a351-cf8m1.4408astm a351-cf81.4401astm a216-wcbaisi 304. 304l, 316, 316l, 301, 430 ect