I have looked to the point of dispare for "∩" shaped 180° (water) pipe 'elbows' in 1/2", 5/8 and 7/8 inch (U.S. plumbing) range of sizes!?! I live in South Florida and just can't seem to find these pieces in quantity.
I'm sure others have inquired about them - and, that there is a commonly used supplier for them - as they are an essential component for running (solar panel) piping 'runs and returns' up and back.
I hope to use ABS type poly-pipe elbows crimp-fitted to commercial (black)H.P. poly-pipe @ around 3/4 inch (±).
A name, number or 'Website' of a supplier would be much appreciated (other than dealers in "priceless-collectable" fittings