Aluminum Pipe Fittings and AL Elbows/ Cap/ Speed Rail/ Flare Fitting
Amazon.com: Structural Pipe Fitting, 1-1/4" Cross - E Short, 21X-7, Aluminum Magnesium, Please note. ID of fitting is 1.68, to take nominal 1-1/4" steel pipe which all have an OD of 1.66". :
Elbow, 1 1/2 in For Pipe Size, Structural Pipe Fitting - 54WJ97|3AE-8 - Grainger
Building Product: Aluminum Pipe Fittings [10308de] | ARCAT