SUPREME AQUA GOLD MOULDED PIPE FITTING EQUAL TREE - SCH80 EQUAL TEE (Size-20mm) - "45 bends or 45 ells" are other names for 45-degree pipe elbows. To join tubes at a 45° pipe angle, use a 45° pipe elbow. This pipe fitting device, as its name suggests, is bent to generate a 45° change in the direction of the fluid or gas flowing through the pipe.