Thread tape is necessary between each connection. Always wrap thread tape clockwise when facing the threaded portion.

You will need to make 2 of these, one with male quick couplers and one with a female.

Put the hex nipple in the vise and tighten the quick coupler onto it. Put the elbow in the vise, male side up, and tighten the bushing onto it.

Rotate the elbow in the vise and tighten the quick coupler/ nipple onto it.