I am solvent welding ABS and noted that manufacturer installation instructions differ from each other.
One manufacturer instructs one to insert the properly prepared pipe into the hub and then twist 1/4 turn. Another manufacturer instructs one to insert the pipe into the hub with a twisting motion. It specifically cautions against twisting once the pipe is fully inserted.
Which is correct? Since the fittings and pipe all meet the same standards, it does not seem that both could be correct.
Now for a second, but related question. There are certainly going to be times when a full 1/4 twist, or even any twist for that matter is not possible. What can one do to compensate for that factor? More solvent-weld adhesive? Two coats of adhesive? In other words, just how critical is the twist?
I have done small projects before with PVC, but this is my first attempt with ABS, so I read the instructions.