Determining Orientation of Pipe Elbows

Hello, I am currently trying to create a model of a ROV made out of cPVC.

I have tried constructing this with pin constraints, however once I get further in the model I start to get numbers that are off by very small amounts.

The small errors prevent me from attaching segments of the model across certain segments.

Is there a way I can orient a PVC elbow in a certain direction instead of leaving it as a pin constraint?

Thanks