ductile iron pipe fittings include: 1. Grooved Coupling (Rigid coupling and flexible coupling). 2. Tee and reducing tee (grooved and threaded).ductile and malleable iron threaded 3. Mechanical tee (grooved and threaded). 4. U-bolt Mechanical Tee (threaded). 5. Grooved Cross and reducing cross. 6. Grooved Elbow (11.25°, 22.5°, 45°, 90°). 7. Grooved reducer (Eccentric and concentric). 8.End cap 9.Flange Threaded black or galvanized Malleable iron include : 1. elbow （reducing and equal） 2. Tee, equal and reducing 3. pipe couplings/socket ,equal and reducing 4. pipe nipples(hexagon), equal and reducing 5. Cross（equal and reducing ） 6. pipe unions (conical joint and flat seat joint) 7. Solid plug. 8. End cap 9. bushing