you can get pipes, elbows tees etc at SSL, Esau, ETC. If its sch 40 pipe, the elbows should also be sch 40. A UT (Ultrasonic test) can be done to determine if it in fact sch 40. The wall thickness for 3" sch 40 is 5.49 mm; sch 80 is 5.62 mm. A vernier can be used to get the thickness in lieu of...