... Reducing couplings has UL, FM and iso9000 certificate . GROOVED TEEBrief introduction SIZE FROM 11/4-8,THE MAX WORK ... malleable iron pipe fittings are made of raw materials of high quality through casting and precision process by automatic pattern extruding ... etc standard thread. Regularly available are the following items: Elbow, tee, cross. Socket, union, bushing, backnut, flange, nipple, etc. The ...